iMac G5 - No Idea

[scott:mac]

Hey.

I have agreed to look at my friends iMac G5.

First problem was

Blank screen - Nothing showing up, but when we shined a flashlight onto the screen we could see the desktop.
=
Backlight Inverter replaced.
Still no joy
=
Continuous ON and OFF using PRAM reset for hours, then it came on worked fine.

Next day we turned it back on - same problem.

NOTES
The chimes never appear to sound.
The flashing white light doesnt always come on.
The computer doesnt make a noise as if it were on.


Please respond ASAP.
Thanks.

 

[BlueRevolution]

I'm going to guess the logic board is going. It's the usual culprit when everything starts acting up, since... well, the logic board controls everything!

That's strange about the backlight, though. I wouldn't associate that with logic board issues...

 

[TEG]

The iMac G5 did have some notorious P/S problems. Perhaps having that tested would be the best thing to do before trying to swap out other hardware.

TEG

 

[MTI]

Open it up and do a visual inspection of the logic board . . . particularly, checking for deformities of the capacitors.

To inspect the power supply, you're going to need torx bits that have the tamper dimple, again to check the caps on the p/s board.