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Apple Desktops Discussion of Apple's desktop machines including Mac Pro, iMac, Power Mac, and mini

imac g5 - is it brain dead?


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lerby

 
Member Since: Feb 07, 2011
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My imac g5 (2gHz, 2G RAM, Ambient Light Sensor model, OSX 10.4.11) went black on me two days ago while surfing the internet. I could hear the fan running, but no picture. I held the power button down for 5 seconds to force it off. But when I tried to restart, nothing. I reset the SMU per this article iMac G5: How to Reset the SMU. After, I pressed the power button and the fan starts, but nothing else. After about a minute the fans kick into high gear and start going really fast. There are no chimes or normal start up sounds. The screen stays black.
Then I found this article iMac G5: Troubleshooting when your computer won't turn on . After going through these steps, the fan comes on and the power light pulses, but nothing else and again after about a minute the fans start going really fast. When I turn the computer off and then back on only the fans come on, no pulsing power light. I reset the SMU again, turn it on, and get the pulsing power light again
The diagnostic LEDS were: 1 lit up before I reset the SMU. 1 and 2 lit up after I reset the SMU. 3 and 4 never lit up.
I replaced the back up battery, no change in imac's condition.
I fear it's the logic board and not worth fixing, but how do I know? Could it be the hard drive? How would I test it?
Any help is greatly appreciated.
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gsahli

 
Member Since: Dec 11, 2010
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I think you've analyzed it correctly. From what you know now, it's not the hard drive.
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harryb2448

 
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Could well be the power supply from your description which may be worth the cost of repairs.

This link may help:-


http://jimwarholic.com/2008/11/apple...issues-and.php

Hang on to those original install discs like grim death! Using OS X.7 or later make a bootable USB thumb drive before running Installer!
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lerby

 
Member Since: Feb 07, 2011
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Thanks for the quick replies.
I'm glad you don't think it's the hard drive.

hb2448 - I had actually been to that site before I posted here. None of my caps looked bad, so I quit reading. I took the time to dig a little deeper and read that they don't have to look bad to be bad! I may just try this.

Thanks again.
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