Model A1225 / Mid 2007 and Early 2008 / 2.4, 2.8, or 3.06 GHz Core 2 Duo processor

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iMac does't boot - fan run at full speed - led 1on

Hi guys, a friend gave me a 24" intel iMac with a broken 8800 gpu.

I replaced it with a 2600pro, but the Mac doesn' boot.

I tried with the 8800 but I get the same problem.

When I plug the power cable in, all the fan start to run at full speed, the screen remains black and the power button doesn't work.

Status led 1 is on but the others are all off.

Wath could it be ?

p.s: I'm from Italy, don't care about my english

Answered! View the answer I have this problem too

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Replace the power supply.

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