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Model A1174 with 2 GHz Core Duo or Model A1207 with 2.16 or 2.33 GHz Core 2 Duo

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It shut down while in use & will not reboot

My imac will not turn back on.

While online my computer shut down.

No lights or sound of any kind.

It was not hot.

I checked the power cord & surge protector.

There has never been a problem in 9 years.

What can I check to figure out how to fix it?

Answered! View the answer I have this problem too

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There are diagnostic lights to the right of the RAM slots, (these are sometimes covered by a small piece of black tape, remove the tape. Remove the cover and observe and see if they change when trying to start up. My first guess is a failed power supply.

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This is my 1st time try to fix a computer. How do I get to the ram slots?

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Pam Heath will be eternally grateful.
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