I've done some searching and haven't come up with an exact answer to my questions. Hopefully you guys can help me out! My 2008 24" iMac won't turn on. No fans, no HDD, nothing. This happened after a power surge, so I'm assuming it's toast. I took it to the Apple Store and they told me that it is either the logic board or the power supply but couldn't tell me which. It would seem to me that since it isn't doing anything when it's turned on that it's the power supply. Does that seem like a logical answer? If so, I think I'll go on and order the psu from the ifixit store and do the work my self. Thanks for any help provided!