The iMac G5, powered by the PowerPC G5 processor, was originally released in 2004.

586 Questions View all

iMac G5 does not boot. gray screen. no power in usb.

I recently aquired an imac G5. when I turn it on, the power light comes on, the drives and fans start up, there is a cd stuck inside so I cant boot from cd drive. and the screen lights up gray. The usb ports supply one flash of power at first, then nothing.

I opened it up and removed the logic board and power supply to see if there were any obvious problems such as bulging capacitors, there are no such problems.

a stamp on the logic board says "apple 820-1212-A"

how can I do further tests to find the cause of the problem?

Answered! View the answer I have this problem too

Is this a good question?

Score 0
Add a comment
Spread Fixmas Cheer
Get $12 off your purchase of $50 or more with code FIXMAS12
Spread Fixmas Cheer
Get $12 off your purchase of $50 or more with code FIXMAS12

1 Answer

Chosen Solution

Here is a link to Apples troubleshooting procedures. Good luck.

For additional help check out this post---look at mayers and richdaves answers

LED power supply and logic board tests

Was this answer helpful?

Score 1


Thanks for the reply,

But I can't find the diagnostics leds anywhere on the logic board. is it possible that it is an older model and does not have them? I salvaged this computer, and do not know how old it is or what model it is as the number is worn off on the base.

I am hesitant to reinstall the logic board because if there are no leds, I would have to diagnose the problem manually anyway...

does anyone have any info on manually checking the logic board? Or other common problems with these computers other than the bad capacitors?

Much thanks


Add a comment

Add your answer

mphillipsshaw will be eternally grateful.
View Statistics:

Past 24 Hours: 0

Past 7 Days: 0

Past 30 Days: 0

All Time: 1,379