Will not power on?
I have a Imac 7,1 Model No A1225 that has worked flawless since day 1 (3 years ago).
I turned the computer off New Years Eve and just tried to power it on today, nothing..... I tried to reset the SMC, didn't work. If I hold the power button in for 5 seconds it will make a sound that sounds like the hard drive starting up, almost like a scratching sound that happens twice. It will not make it past that point.
After removing the screen with suction cups there are diagnostics lights on the logic in the lower right hand corner. They will tell you if your power supply has failed.
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