IMac G5 - Deep sleep - Will not wake up + Fans rev-up.

iMac G5 ( not under any recall programs and no bloated capacitors )
will not come out of deep sleep and the fans start to rev up after 1 min and
stay revved up on hi.
Tried all possible solutions:
Via keyboard : Reset pram + Open firmware
Reset SMU via power cord and the internal smu button.
Sleep light firmware is installed
Reinstalled 10.4.0 and went to 10.4.7
Tried to scare him with a glass of water, still nothing.
With iStat all temps a cool.
External fan on the PSU to keep it cooler.
Forced the iMac to have the fans on hi by booting in single user mode.
Rebooted. Fans still on hi. logged on then let it go to sleep on its own.
Monitor set at 1 min and HD at 5.
Monitor went to sleep but not the HD.
Forced deep sleep and it worked.
But Same symptoms on wakeup.
Removed the cover:
From a cold power up to video display all 3 led's light up.
http://docs.info.apple.com/article.html?artnum=301283
Deep sleep:
Leds 1 and 2 stay on, led 3 shuts off, normal .
Wake from sleep:
Led 1 and 2 are still on.
Led 3 lights up for a fraction of a second and does not come back on.
Checks the disk drive then spins down ( when a disk is present )
Checks the HD then spins down.
1 min later the fans start revving on hi.
Force reboot is required.
Symptoms started after 10.4.8 update. ( Yes I know about unsanity docks )
Coincidence? Maybe, maybe not. I wait until that fat lady sings.
Please keep this post to the specific symptoms and to PPC G5 imacs.
Has any one ( iMacs G5) with these symptoms been cured?.
How can you uninstall the sleep light firmware patch to reinstall it?
I know that it stops the fans from revving.
Any known Open firmware manual?
PM B&W G4 1Ghz Sonnet :: And still strong Mac OS X (10.3.9) If it aint broke, tweak it. If it breaks then fix it and tweak it again.

If your Mac happily goes to sleep but won't wake up--Hold down the power switch to force-reboot your machine and get it running again.
Don't worry-your Mac isn't narcoleptic. Its Open Firmware system or NVRAM (nonvolatile RAM) is likely corrupt, and your Mac can't remember how to wake up.
Restart your Mac and immediately hold down the Command-Option-O-F key combo until you see a somewhat intimidating command-line display that ends with the Open Fimware prompt. Type the following line:
reset-nvram
press the return key on your keyboard
set-defaults
press return
reset-all
press return
Your Mac will reboot. Once it's running, put it back to sleep to test. If the problem recurs your Energy Saver preferences may be the culprit. Delete the com.apple.PowerManagement.plist file (go to Finder/Hard drive/Library/Preferences/SystemConfiguration)--don't worry, your Mac will regenerate a new one--and then restart to see if that rights the wrong.
Still didn't work? Might be time to call AppleCare or see an Apple Genius or a technician.
Cheers!
DALE

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IMac G5 - Deep sleep - Will not wake up + Fans rev-up.

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