How to disable the Firmware Lock on iMac G5

[javad hashemi tafreshi]

I wonder if anybody could help me to disable the Firmware on my iMac G5
I cannot do anything except to invoke rainbow ball and That is
I have been told that unless I disable the firmware lock no repair is possible
Best regards all all
Javad

[Drew Reece]

If it is a G5 it will be Power PC - I assume you have set an open firmware password …
https://support.apple.com/en-us/HT1352
If the UI is different at startup you may have an Intel Mac & it may be different.

Older iMacs can have the password reset by powering off and removing stick of RAM & then rebooting. The hardware detection phase resets the variables IIRC. Try a PRAM reset too, hold option + cmd + P+R at startup & wait for 3 chimes (after altering the RAM).
You can also open the iMac remove the clock battery & it should also reset after it drains, leave it without power for a while.

I don't see how it will alter the 'rainbow cursor' but it can make troubleshooting difficult.

Re:co

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[javad hashemi tafreshi]

My iMac G5 is powerPC(3,1) Power Mac 8.2 based with2 Gig memory ,PCM3032 bus speed 667GHz
The instruction with Command R did not have any effect it just opened the normal Screen.
somebody already done B part of the instruction and made the mac work. But Diskwarrior
does not work and the company says my Firmware is locked
Javad

> On 11 Mar 2017, at 13:06, Drew Reece <dru...@gmail.com> wrote:
>
> A If it is a G5 it will be Power PC - I assume you have set an open firmware password …

> https://support.apple.com/en-us/HT1352
> If the UI is different at startup you may have an Intel Mac & it may be different.
>

> B Older iMacs can have the password reset by powering off and removing stick of RAM & then rebooting. The hardware detection phase resets the variables IIRC. Try a PRAM reset too, hold option + cmd + P+R at startup & wait for 3 chimes (after altering the RAM).

[Drew Reece]

Javad,
It's a Power PC Mac it doesn't have a recovery partition. Cmd+R will not work, you need to use the original installer disks (or discs that upgraded the OS) to do repairs etc.

Insert the disc & hold c on startup, eventually it may boot from the disc (it takes quite a while to boot from DVDs/CDs) otherwise use startup disks in System Preferences to pick the boot disk - is the Disk Warrior disc shown in that list?

Look up the disk warrior version spec & confirm it boots PowerPC Macs, I doubt new versions will.
Are you seeing the blue screen with the padlock as that page I linked shows? That is the indication that you have a firmware lock, the company may just be assuming based on the fact you have no recovery partition, but that may be wrong.

Personally I'd run disk utility's first aid before running disk warrior. That is on the Mac installer discs.

Re:co