USB ports don't work
JClark
(I posted this also on the ASUS site, but was hoping to get some help
sooner than that forum usually provides it.)
New install of the M4A78-E, Windows XP Pro SP3.
Problem: The on board USB ports don't work. None of them. USB ports
connected by cable to the board, such as case ports, external ports
etc work fine.
I've uninstalled all of the items under Universal Serial Bus
Controllers in Device manager, one at a time. Checked the BIOS to see
that everything with USB in it is enabled.
Very peculiar that only the ports coming directly off the motherboard
(without connectors) are not working.
This is very frustrating, with added frustration by my recognizing
(after purchase, of course) that this board doesn't have a PS2 mouse
port!
Any help or suggestions would be greatly appreciated..
Jack
Paul
There really isn't much that can go wrong. Each USB port needs power,
and there is a green Polyfuse for each pair of ports. You can see
three fuses near the I/O plate area. And three more, near the 2x5
headers for USB. You could do a quick visual check and see if any of
that is missing.
I downloaded an ATI/AMD programming manual, and the claim there,
is there are two EHCI controllers and four OHCI controllers for regular
USB ports. That means USB2 operation is split into two groups.
USB 1.1 is split a little weird, in that I think three USB ports
are tied to each USB 1.1 controller.
In any case, you could check Device Manager, and see if the
two EHCI and four OHCI items showed up. There is a fifth OHCI
which is apparently for hardware debug, and it may appear in
Device Manager as well. I don't know if they'd make an
extra effort to disable it, because there might not be
any way to physically access the associated ports on a
finished motherboard.
What you see in Device Manager is not a "port". You cannot count
ports by looking at Device Manager. What shows in Device Manager
are the logic blocks driving the ports. If the Southbridge is
designed to drive three ports from one OHCI, you see one OHCI
entry in Device Manager.
Based on your failure symptoms, it could be everything on one
of the EHCIs that isn't working. But again, it is unlikely
for something to fail that way. If an EHCI block wasn't working,
the OHCI still might, and a plugged in device would end up
controlled by OHCI. Which is why I'd be more focused on verifying
the ports are getting power, than anything else.
OHCI (USB1.1) ---X\ One logic block or
+-X----- Physical port the other one, is in
EHCI (USB2) ---X control of the port
The only chip in my recollection, with a serious issue with
USB, was Intel ICH5. The internal bond wires used to burn,
the ones that feed the USB I/O pads. This would cause all USB ports
to be "dead". But all the logic blocks would still appear to
be working in Device Manager. It was down at the I/O level, that
the I/O pads didn't have any power, so the I/O wasn't able to
communicate with any connected USB items. There hasn't been
that style of failure in chip design, since that happened.
So I doubt this is a chip design issue, or even a chip test issue.
I'm sure the chip was fully tested before it left the AMD factory.
If you can't get it working, return the motherboard.
Paul
JClark
Paul,
Thank you so much for a very complete and lucid explanation of what
for me is a complex situation. I will peruse your note tonight and
work on some of your suggestions.
The reply in the ASUS group suggested that it might be the IO plate,
since the problem seemed to be exclusive to the ports coming out of
that plate, not the case ports cabled directly into the MB. Well,
that's what it seemed like initially, but with more experience, I am
learning that it's really very intermittent and applicable to all of
the ports, suggesting that it isn't a simple mechanical issue. Since
last night it's been running fine on one of the IO plate ports, but
again, it's not consistent.
Many thanks again. I'm dreading returning the board for obvious
reasons. But I'm a bit irritated that they didn't put a PS2 mouse port
on it, and I didn't check carefully enough to notice it didn't have
one when I bought it. Live and learn...
Jack
JClark
wrote:
PS:
My chip is AMD phenom X4.
Jack
Paul
The chip that controls USB is the SB750 Southbridge. It would be
the same chip that operates the main SATA ports.
The removal of PS/2 is part of legacy port removal. I've heard of
at least one motherboard being legacy free, so that would mean no
PS/2 port at all, no PCI slots, no parallel port, basically USB and
PCI Express for interfaces. So there are "very modern" boards, for
the people who seem to feel that is the right direction to go in. I've
never had a problem with PS/2 here, and I favor reliability over
fancy titles.
The chip that drives PS/2 is the SuperI/O. Eventually, a point
could be reached, where the SuperI/O could be removed from the
board entirely. But right now, it still has hardware monitoring
of voltages, temperatures, and fan speed. And I haven't heard
of that being on the chopping block.
Sometimes, when a port is chopped for being "legacy", the
actual electrical interface is still there, and it simply
isn't hooked up to the I/O area. An example of this
kind of silliness, is what happened with floppy. At one
point, a SuperI/O floppy interface could control two
floppy drives, A: and B:. Then, the legacy nonsense was
interpreted by the manufacturers as, "hey, let's remove
the control signals for one of the floppy drives". The
chip itself may have still had the circuitry for
two floppy drives (for people who transfer files from
floppy to floppy), but if you hooked up the floppy
cable, only one would work. Again, you can find today,
boards where floppy is missing entirely, so I guess
that is progress. Personally, I wouldn't remove the
floppy port, until all OSes stopped relying on it
for drivers during installation. Removing it complicates
things for people.
*******
PS/2 ports are available in a number of configurations.
1) The "old way", a keyboard and mouse port, in a single stack.
2) A single connector, with +5V,GND, clk/data for mouse,
clk/data for keyboard. The Mini-DIN has six pins, so there
is room to put all the signals on the one connector. Boards
like this, come with a "Y" cable, so that the user can gain
access to both functions. In that way, a single connector
supports both PS/2 mouse and keyboard simultaneously. Without
the adapter, only one of the two options works directly, if
you don't use the Y cable.
3) I've seen a board with a half green/half purple colored
PS/2 connector. Apparently, the port then can function
as either a PS/2 mouse or as a PS/2 keyboard, but not
both at the same time. Maybe they do this, by wiring the
clk/data pairs in parallel.
4) And your board, with PS/2 keyboard only. They leave keyboard,
so you have a guaranteed way of getting into the BIOS. The
mouse isn't needed for the BIOS, so they feel USB is good
enough for that.
You can purchase a USB to PS/2 adapter. It costs $5 to $10,
and for that money, you're getting a processor and firmware,
within the connector on one end. A single chip holds all of
that. The early ones had some firmware issues, and tended to
hiccup after about ten minutes of usage. Presumably, the
firmware has been tweaked after their bad start.
(The reviews aren't wonderful)
http://www.newegg.com/Product/ProductReview.aspx?Item=N82E16812101117
(They make an I/O plate version as well, USB to PS/2. Uses internal USB
connector. Comes with cable suitable for a USB 2x5 header interface.)
http://images17.newegg.com/is/image/newegg/15-158-116-S01?$S640$
There is even a version that plugs to a PCI slot. It consists of
a PCI to USB chip, plus the USB to PS/2 dual adapter chip. In
this picture, you can see the size of the single chip that
does the protocol conversion from USB to PS/2, near the PS/2
connectors.
http://images17.newegg.com/is/image/newegg/15-150-153-S01?$S640$
So you can spend money to fix this little shortcoming, as long
as you're not a KVM user. The adapter doesn't seem to work that
well with KVMs.
*******
As part of your USB problem solving, you could plug in a PCI to
USB card, and try testing how well USB works with that. If
the USB on those ports works reliably, and the other (motherboard)
USB ports don't work well, I'd get the motherboard replaced. With
the reliance on USB for so much of the motherboard interfacing, it's
important that you get a fully working one.
Paul
Don Lope de Aguirre
news:2mtkg550omo6s3oot...@4ax.com...
> Many thanks again. I'm dreading returning the board for obvious
> reasons. But I'm a bit irritated that they didn't put a PS2 mouse port
> on it, and I didn't check carefully enough to notice it didn't have
> one when I bought it. Live and learn...
>
> Jack
That happened to me with Asus P5K mb. Threw me for a loop because I needed
both PS2 keyboard/mouse because I have a PS2 only KVM. Some twat on here
told me a PS2 splitter would work so ordered one of those and it didn't work
at all. Those splitters apparetly are for Laptop computers and the bios is
different so you can use a PS2 splitter. In the end I bought another USB KVM
and changed to USB keyboard, mouse was already USB but used PS2 adapter on
it. My latest Asus mb is the P7P55D LE and that has both PS2 mouse and
keyboard so can now use my PS2 KVM again. Why put PS2 keyboard port on a mb
and not PS2 mouse also is mind boggling. When I read the specs for P5K I saw
PS2 so assumed it was mouse and keyboard PS2. Obviously I assumed wrong and
will never make that mistake again. Only real oddity I see on my P7P55D is
floppy cable port but no IDE port, I don't need either but WTF put a floppy
cable port and no IDE port? Floppy drives are useless these days and IDE
still has some use. The other oddity is a com port on the mb. Who the fuck
needs a com port these days?
Don Lope de Aguirre
news:heegie$s4e$1...@news.eternal-september.org...
> The removal of PS/2 is part of legacy port removal. I've heard of
> at least one motherboard being legacy free, so that would mean no
> PS/2 port at all,
Removal of mouse PS2 but leaving keyboard PS2 is not a legacy free mb, it's
just a boneheaded decision by someone at Asus. My latest Asus P7P55D mb has
both mouse and keyboard PS2 so it isn't dead yet because this mb is for
i5/i7 which are latest and greatest CPUs.
Ross Ridge
>My latest Asus mb is the P7P55D LE ... Only real oddity I see on my
>P7P55D is floppy cable port but no IDE port, I don't need either but
>WTF put a floppy cable port and no IDE port? Floppy drives are useless
>these days and IDE still has some use.
The Asus P7P55D LE (and all P7P55Ds as near as I can tell) has an IDE
connector but no floppy connector. That said, it would make a certain
amount of sense to include a floppy connector but no IDE. Adding a floppy
connector costs almost nothing since all Super I/O chips support it.
Adding an IDE connector costs more because it requires adding another
chip. Intel dropped support for IDE in its south bridges some time ago.
> The other oddity is a com port on the mb. Who the fuck needs a com
>port these days?
It's something else that costs almost nothing since it's included for
free in the Super I/O chip. I want my next motherboard to have one to
support some old hardware of mine, but the position of the connector on
most of the P7P55D boards, behind the memory modules, makes it pretty much
useless for me. Hmm... the P7P55D LE would work though. I imagine
the serial port gets some use in home theatre applications these days.
It can be used with infrared receivers for remote controls, and some
higher end AV equipment like TVs and receivers have RS-232C ports.
Ross Ridge
--
l/ // Ross Ridge -- The Great HTMU
[oo][oo] rri...@csclub.uwaterloo.ca
-()-/()/ http://www.csclub.uwaterloo.ca/~rridge/
db //
Ross Ridge
>Sometimes, when a port is chopped for being "legacy", the
>actual electrical interface is still there, and it simply
>isn't hooked up to the I/O area. An example of this
>kind of silliness, is what happened with floppy. At one
>point, a SuperI/O floppy interface could control two
>floppy drives, A: and B:. Then, the legacy nonsense was
>interpreted by the manufacturers as, "hey, let's remove
>the control signals for one of the floppy drives". The
>chip itself may have still had the circuitry for
>two floppy drives (for people who transfer files from
>floppy to floppy), but if you hooked up the floppy
Yah, I don't get that. All Super I/O chips I've seen support two
floppy drives. I can understand saving a few pennies by not including
a floppy connector at all, but by only supporting a single floppy drive
all they're saving is a couple of traces on the motherboard.
Michael W. Ryder
I use one to connect to an RS/6000. I can also connect using ethernet
but prefer having the serial connection as I can maintain the RS/6000's
ethernet settings even when it isn't working. I also still use a
dial-up modem to connect to one of our companies clients which only
allow the connection to be made this way, security regulations.
JClark
> plug in a PCI to
>USB card, and try testing how well USB works with that.
Paul,
You are a storehouse of information. I'm copying all of your messages
for storing as "textbook" files.
I'll try that test. It's cheap enough. Certainly USB reliability is
critical.
I have about two more weeks to return the MB to the vendor, so I'll
work with it for a bit longer.
Things do seem to have changed a bit. My original assessment (only IO
based USB ports not working) was in error. Now all of them are working
intermittently. For example, I just booted the system with the USB
mouse in an IO port, and it was dead after boot. I unplugged it and
replugged it in the same port, and it lit up and worked.
Strange ... at least to me.
Many thanks.
Jack
Paul
Not that it matters, but do you see the correct number of
"Enhanced" entries in the USB section of Device Manager ?
That should be two. And for the other type, either four
or five of them. At least, according to the ATI docs for SB750,
which are rather generic (i.e. treated as SB7XX). I'm trying
to determine here, whether what is inside the chip is being
detected OK.
This example actually contains two devices, a Southbridge
and a NEC USB card.
http://www.usbman.com/Guides/checki4.jpg
24D2,24D4,24D7.24DE are USB 1.1 blocks (enough for eight ports on Southbridge)
Standard Enhanced PCI to USB Host Controller (USB2 for all eight ports on Southbridge)
NEC PCI to USB Open Host Controller (two of them for four PCI USB card ports)
NEC PCI to USB Enhanced Host Controller (USB2 for all four ports on PCI USB card)
In your case, I'm expecting two Enhanced entries from SB750.
And four or five others.
*******
Other than USB power, early BIOS screens had a "USB drive strength"
setting. I haven't seen such a setting, since the first generation
of USB2 devices were introduced. And in the few instances where
that was adjusted, nothing seemed to happen. So it's not like
there was a marginality evident.
Do you have a complete list of what USB devices are connected
in your computer ? Is there anything in that list which is
unusual or ancient ? Do you have any complex networks of
external hubs ?
On the one hand, in terms of the physical implementation,
there is a certain degree of sharing. For example, your
USB 1.1 logic block being shared over three ports. The
+5V power coming through a Polyfuse, being shared over two
ports. If you observed a clustering to the problems,
that would make it easier to blame something. I can't explain
random dropouts, short of something being wrong with
some aspect of the power in the system. That could even
include a marginal low voltage supply to the Southbridge
logic. But if that was the case, you'd likely see more than
USB dropping out, and some other ports would be affected,
like SATA.
You could also test with an alternate OS, but there the problem
might be, getting all the ports recognized to the same degree
as Windows manages to do. So that is unlikely to be a good
enough test, to add anything to the diagnosis.
If you want a USB item display, you can try UVCView. There is
an archived copy on here (click any of the dated links). This
reports config info as delivered by the USB devices, and indicates
whether endpoints have been set up and so on. When your mouse
goes missing, see if you can see anything here. With this tool,
you might see up to 24 lines in the display - 12 entries for the
ports running at USB 1.1 rate, 12 entries for the ports running
at USB 2.0 rate. A plugged device can only run at USB 1.1 or USB 2.0
and not both, so of the 24 lines, a max of 12 can be occupied. So
this tool is more "port oriented", unlike the Device Manager
USB entries. I don't think this tool works for things connected
through a hub, and it only reports on things directly
connected to the computer.
Paul
GMAN
others to do the work and research for you. Then when something goes wrong or
you dont like the result, you started calling me out and flaming me for just
trying to help. I never said it was a sure thing that a splitter would 100%
solve the problem, i only said that it was cheap and worth a try.
I , and many others back then only tried to help and you turned around and
acted like a cuntface.
Suck my cornhole
JClark
>correct number of
>"Enhanced" entries in the USB section of Device Manager ?
>That should be two.
Yes, there are two (view screenshot here):
https://secure.storegate.com/user/share.aspx?id=07e38411-a55e-4003-abf0-644bd93a1d27
>Do you have a complete list of what USB devices are connected
>in your computer ?
The only thing connected now is the USB mouse.
I did have connected an external hard drive, which I used to copy a
lot of files from the computer this one is going to replace, but it's
currently disconnected.
Incidentally, or parenthetically, and not to confuse the issue, but my
BIOS (latest one 1708) may be flaky. Whenever I connect the USB hard
drive, BIOS changes all my previously set boot sequences and boot
device configurations and makes the external hard drive the first boot
device, which causes boot failure. I have to re-do the BIOS settings
if I ever disconnect then reconnect the USB external hard drive.
"Curiouser and curiouser".
>try UVCView
Looks interesting. I'll work on in tonight (work calls!)
Many thanks again, and I will report back.
Jack
JClark
wrote:
>>try UVCView
Links to the UVC view output:
https://secure.storegate.com/user/share.aspx?id=bb71ac5c-81a7-49b5-a630-d7a20e5ca057
https://secure.storegate.com/user/share.aspx?id=96feec04-930a-485e-9889-a9be88d8df3c
Don't know what it means, but thanks again for help.
A couple of more thoughts:
I've just restarted the computer 4 times. Consistently, the USB mouse,
plugged into a USB outlet on the IO plate, is not recognized at the
time the Welcome screen appears. I unplug it and replug it, the
optical light in the mouse comes on, and it works fine.
I'm beginning to wonder if this could be BIOS related? Since I've
reset just about everything in BIOS numerous times, I'm wondering if
it might be a useful "test" to revert back to an earlier BIOS version?
Am I just grasping, or does that make any sense?
Many thanks!
Jack
Paul
If you click on the USB Human Interface Device entry, the pane on the right
would show the details for the device. Sometimes, if you examine that pane,
you'll see there are no "end points" set up, which means there was a problem
during device setup. The pane also contains info so you can verify whether
a device is running at USB 1.1 or 2.0, or the device is capable of
running 2.0. You need some info off the web, to decode the rest of it.
Googling some of the items on the right, may dig up the articles
with decoding info. I don't see the article I'm looking for, in my bookmarks
right now.
(Some background info, for when you're bored)
http://www.totalphase.com/support/articles/article20/
http://www.lvr.com/usbcenum.htm
So at least in terms of what I've seen so far, the logic blocks are there,
and seem to match the info shown in the ATI Southbridge document. Six
ports per USB2 controller. Three ports per USB 1.1 controller.
If you wanted to examine the USB mouse using UVCView, while it was in
the "non-working" state, you'd need to use a second mouse. You'd have
to be pretty clever, to be able to get to that point using nothing
but a keyboard. You can have multiple mice connected, and all of their
input is combined. So if you needed to start the program, and examine
the info there, a second mouse might work. I've used multiple input
devices on Windows, and Windows handles them pretty well.
In the past, when a person had a problem with device detection,
a workaround (not a cure), was to play with the power supply
feeding the USB header. In years past, each pair of USB ports
could be set to either run from +5V or +5VSB. +5V is interrupted
when you do a "soft-off" at the end of the day, while the +5VSB keeps
running. If the problem is one of keeping the errant USB device
powered, you could change to +5VSB. Or vice versa. If the device
is playing dumb and is running from +5VSB, you could try
using +5V, on the theory that the fresh presentation of power
at startup, would lead to a successful enumeration. But modern
boards don't have that option, and tend to run the ports
from +5VSB permanently. They don't put a jumper block on the
board any more called "USBPWR" for making those changes.
Sure, you can play with the BIOS revision, but I don't have
a theory as to how that would help. At some point, the BIOS
hands off control to the OS, and after that, it is up to the
OS to enumerate the hardware, enumerate the USB bus, and
give all the devices endpoints and addresses. It could be
a disagreement between the device itself and the motherboard,
where one of the two parties isn't playing by the rules and
has ignored something important. On USB, multiple bus resets
are used as part of the protocol, and are part of the
enumeration process. And a failure to pay attention to a bus
reset, would be enough for a device to be "invisible".
Changing the BIOS revision, would be purely a long shot.
There are software packages and hardware devices for debugging
USB problems, neither of which I have any experience with. And
the hardware devices for this job, wouldn't be cheap, because
their designers have to eat. There is no guarantee a software
package could see all the details, as it would be just
as handcuffed as your OS is right now.
Paul
JClark
>If you click on the USB Human Interface Device entry, the pane on the right
>would show the details for the device.
Will try to see that information and interpret it.
>background info
Links saved and will peruse.
>play with the power supply
>feeding the USB header
I presume this is done in BIOS. Will investigate.
>Changing the BIOS revision, would be purely a long shot
Glad to hear that, I guess. I wasn't looking forward to it.
Paul, I guess you have exhausted your obviously superior knowledge of
the USB area on this problem. I sincerely appreciate it.
I may indeed have to replace the MB, and if I do, I will get one with
a PS/2 mouse outlet, for sure. In fact, I've probably spent a lot more
time playing around with this issue than I would have with a new MB
install. It's not the mechanics of installing the new board,
processor, etc. But I really dreaded the OS and software install and
configuration which take so much time.
But, hey, I learned some things.
"Good results come from experience. Experience comes from bad
results."
Many, many thanks.
Jack
Paul
I see you've been over to the forum.
In this thread, "Buck" did an RMA on a board with slightly different
symptoms. First the SATA wasn't being picked up at startup, and
then later, USB problems developed, with the USB disappearing
after it was running for a while. He did the RMA, and still had
problems with the disk. The thread doesn't mention any more problems
with USB. It could be something in that case, with a voltage regulator
feeding the Southbridge. If the board had a setting for SB voltage,
you could bump it up one notch.
Section 3.5.17 of the M4A78-E manual mentions "SB Voltage"
and it looks like it has at least two settings of 1.20V
nominal and 1.35V boosted setting. You could try that out
for one or two restarts and see if there is any difference
in symptoms.
Or, you could boot a Linux LiveCD and see if the mouse
is working there. Ubuntu is an example. Knoppix from
knopper.net is another. There shouldn't be a problem
with them detecting a mouse.
Paul
JClark
>I see you've been over to the forum.
Yes, I posted there first. Also posted a "sharing" note about the RAID
configuration for this drive. Buck's problems seem related to the
Seagate drive. I returned two of them and they were replaced by
Seagate, but this system has WDC Caviar SATA hard drives.
>"SB Voltage"
>and it looks like it has at least two settings of 1.20V
>nominal and 1.35V boosted setting.
I tried the 1.35v (there was nothing in between). But somehwere along
the road I got into real problems. The sequence of events has be come
a bit muddy (it was late at night).I'm not sure that had anything to
do with the voltage change, but the system quit booting at all past
BIOS. So I did flash the BIOS back to a previous version. No help. Now
things are really messed up. I had to delete the RAID configuration,
which deleted the MBR, etc etc. So I'm back to reformatting and
reinstalling!
I've got the RMA and will change the board. Thinking about a more
expensive Tyan socket AM2+ which will accept my AMD phenom X4
processor, and it does have a PS/2 mouse outlet.
So I'm just playing around with this for the time being, since I can't
ship the board until tomorrow.
Many thanks again.
Jack
JClark
wrote:
>So I'm back to reformatting and
>reinstalling!
Paul,
After reformatting and reinstalling Windows, I went back into the BIOS
and increased the Southbridge voltage to 1.35. Amazing difference.
This appears to have solved the problem. I've rebooted warm and cold,
with the mouse in IO USB connectors and in those cabled to
motherboard. Success each time!
You're a genius.
I must now post this response in the Asus forum.
There are some other quirky features of this board someone should
discuss elsewhere. For example, when a USB external drive is
connected, the BIOS automatically configures it as the first boot
device. You have to work around it. etc etc
Anyway, I can keep the board. Thanks again!
Jack
Paul
Cool :-) Just a guess based on that other report of the
SATA having problems too.
Paul
Don Lope de Aguirre
news:hefhl1$5rk$1...@rumours.uwaterloo.ca...
> The Asus P7P55D LE (and all P7P55Ds as near as I can tell) has an IDE
> connector but no floppy connector. That said, it would make a certain
> amount of sense to include a floppy connector but no IDE. Adding a floppy
> connector costs almost nothing since all Super I/O chips support it.
> Adding an IDE connector costs more because it requires adding another
> chip. Intel dropped support for IDE in its south bridges some time ago.
Oops, right you are, I don't use either IDE or floppy any more and only
glanced over it and for some reason thought it was a floppy connector (it's
dark in there). They can remove both of those as far as I am concerned but
still need PS2. I didn't know there are infrared sensors that use serial
either but I would think most people with htpc would have USB infrared
sensors.
Don Lope de Aguirre
news:3sUOm.8062$mn3...@en-nntp-03.dc1.easynews.com...
> You know what, "YOU" are the twat for not thinking for yourself and
> relying on
> others to do the work and research for you. Then when something goes wrong
> or
> you dont like the result, you started calling me out and flaming me for
> just
> trying to help. I never said it was a sure thing that a splitter would
> 100%
> solve the problem, i only said that it was cheap and worth a try.
>
> I , and many others back then only tried to help and you turned around and
> acted like a cuntface.
>
> Suck my cornhole
I did think for myself and thought I had bought a mb with PS2 mouse and
keyboard. You said it would work and not maybe, liar. I am a cuntface
because that whole fiasco caused me down time and an extra $80.00 to get the
PS2 splitter and then a USB KVM. And all because someone at Asus thought
having just a keyboard PS2 port was a good idea. Well, it wasn't and it
pissed me off majorly. Nothing personal mind you, I just like being a
"cuntface".
Don Lope de Aguirre
news:3sUOm.8062$mn3...@en-nntp-03.dc1.easynews.com...
Oh no, Gman is also Chris Crocker, run for the hills.
GMAN
JClark
mouse to a new one and the problem seems to have disappeared. The one
which was not working was an old IBM USB mouse. As soon as I bought a
new wired USB mouse today and put it in, the problem seems solved.
So now I'll reset the Southbridge voltage back to its nominal 1.20v.
I appreciate the help and apologies for not trying the simplest
solution first. That old mouse always worked fine with my laptop!
Jack