I have the above laptop and after troubleshooting it for a failure to
turn on, I decided to open it all up and see if I could find something
wrong. I looked for loose cables or a heat sink that was loose since
the problems started out inconsistent and jumped all over the place with
different symptoms, culminating in the failure to turn on.
After finding nothing, I decided to reconnect the motherboard with the
minimum hardware required to see if it would turn on. At first I added
RAM, attached the display cable, the power switch, CMOS battery, and the
power lead from the power adapter. No LED or any sign of life occurred
when the power switch was depressed. I felt that should have been
enough to at least turn on the computer, but I thought I would add one
component at a time to see if more was required. I then attached the
keyboard cable and tried it again. The computer powered up.
Eventually I attached all the other cables and hardware checking it
after each was attached. It powered up with no problems. In fact it
appears as if I solved my computer problem with power not starting or
even lighting the power LED. It has been working flawlessly ever since.
My question is this: Does the lack of a keyboard on a laptop inhibit
the power from turning on?? I have worked on many desktop computers and
the lack of a keyboard generally produces an error message during POST.
I have never seen one stop it from powering up. I hate solving a
problem and not understanding why it behaved as it did. My guess is
that a poor connection to one of the cables was the cause, perhaps the