[X4U] How can you diagnose a power supply problem?

[Wayne Clodfelter]

I'm thinking it may be a bad processor and not the power supply. I  
bought a replacement power supply once. Still have it. It turned out  
to be the processor. This, for a Quicksilver.

On Nov 23, 2010, at 10:40 AM, Mark Des Cotes wrote:

> Hi all,
>
> I have an iMac G5 iSight that's been giving me problems. I started  
> getting kernel panics on an increasing basis. Mostly on startup but  
> sometimes once it was  up and running. It got to the point that I  
> would have one every 10-15 minutes. Ran Disk Warrior, Safe mode,  
> repaired permissions, ran hardware test, everything said the  
> computer was fine. Yesterday morning it wouldn't wake from sleep.  
> Shut it off via the power button and tried to restart it, fans came  
> on and the white light on the front lit up but nothing else. I  
> couldn't hear the HD and no response from the DVD drive when I try  
> to insert a disk. After a few minutes the fans sped up but that's  
> it. Tried a few more times with the same results.
>
> I opened the iMac up (thank you YouTube) and removed the HD and put  
> it in an external enclosure I have. It works fine. I'm able to  
> access it from my wife's MacBook. I made a clone of the drive to be  
> safe. I put it back into the iMac and got the same results as  
> before. I now know that the HD works so I'm thinking it's something  
> else. My guess is the power supply but I'm not sure as I've never  
> had one go on my before. Could it be that the PS has enough juice to  
> run the fans & light but not the HD or optical drive? I thought that  
> when a PS went nothing wold work.
>
> Any and all help is appreciated.
>
> Mark Des Cotes
> Owner-Graphic Designer
> Marksman Design
>
> Mailing address:
> 7-841 Sydney Street, Suite # 338
> Cornwall, Ontario  K6H 7L2
> Canada
> 613-936-6876
>
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>
>
>
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Wayne Clodfelter
wayneclodfelter at mindspring.com