My new iMac 1.8Mhz 20" completely died the first day I received it. The problem started where the machine would go to sleep as I used it and I could not wake it back up unless I unplugged it, let it sit, and then powered on again. The problem grew progresively worse so that I could never get it back on. I had previously turned off all of the sleep settings but it would still turn off as I typed. I would hit a key on the keyboard, the light on the lower RH corner on the monitor would appear for a second, then just go out.
When I called tech support, they asked virtualy no questions and had me do a "parameter reset" (Option-apple-P-R) as I turned on the system. Nothing. Next they had me take the back off and press a button on the main PCB for 20 sec to reset the NV ram. No luck!. The rep said sorry - take it in for repair! No questions - very matter of fact like he had heard this many times before. I called a friend of mine and he informed me his died after 2 days and it currently was at Comp USA for repair. I think ther may be some serious power isssues with these new iMacs

When I called tech support, they asked virtualy no questions and had me do a "parameter reset" (Option-apple-P-R) as I turned on the system. Nothing. Next they had me take the back off and press a button on the main PCB for 20 sec to reset the NV ram. No luck!. The rep said sorry - take it in for repair! No questions - very matter of fact like he had heard this many times before. I called a friend of mine and he informed me his died after 2 days and it currently was at Comp USA for repair. I think ther may be some serious power isssues with these new iMacs