IMAC Powers Down by itself, When it reboots only the Spot Light visable

Hi,
Hope someone can help, we have two Imac 20' G5 2ghz with 1.5gb Ram. Both system are crashing with the same problem.
The IMAC Powers Down by itself, and when it reboots only the Spot Light Field is viable, Only way to recover it is to rebuild OS. Sent the System back, and Both Logic board and Hardrive were replaced, and the day system crashed again did they same thing. We also have 2 Imac 20' G5 Isight Models working in the same envioroment and are not experiencing any problems with those systems. Any Ideas?

Sounds to me like you may have bad power supply units. I know of several people who had Rev B machines that were covered by THIS repair program.
Even though it says rev A machines are covered. It seems like some that were made early in the switch still used some of the components that were fingered out as not functioning properly. I would check your serial number.
Either way, give AppleCare a call, you should still be covered. And if you had some things replaced, like you said, let them know its doing same thing. Its for this reason that I have a hunch you are getting those old MBs that were having issues. Its more than the Power supply I sispect. Since you cant run it normally when it does power up, seems to me you may have several issues going wrong at the same time.
Hope you get it fixed.

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Generally, this is an issue which indicates that your power supply is defective.
AppleCare extensions to the original warranty cover the costs of parts and labor to replace such a defective supply.
You did not indicate which specific iMac model you have, but posted your inquiry in a forum for iMac flat panel models based on the G4 processor, none of which could be presently covered by a conventional AppleCare policy, as all such machines were manufactured and sold more than three years ago.

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The error means a bad fan motor or the HDD has failed. In your case it's the latter. You can try the following:
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Hi sfuentes,
You need to check iCloud to see if they are actually there. Go to iCloud.com and sign in and then look at your Contacts there to see if the old ones are still showing on iCloud.
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https://support.apple.com/kb/ph12521
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Have you tried wiggling the AC power cord at both the wall socket (or surge protector bar)? You may possibly have a bad socket. Is anything else also plugged into the same surge protector preferably something that would stay off if its AC was interrupted. A light would not do since it could just barely flicker while that interruption would shut off the computer.
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Hi, GTallTx!
So that the Community can help you better, we will need to know exactly which operating system is running on your computer. That, and any other details you'd like to give will help the Community better understand your issue!
Thanks and have a great day!

IMAC Powers Down by itself, When it reboots only the Spot Light visable

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