I need some help. I just inherited my father-in-laws broken iMac. He recently had a power surge and now the iMac powers up, you can hear the hard drive spin, but the screen won't come up, doesn't light up at all, however it also doesn't output any video to an external monitor via the mini-DVI adapter. I don't think it fried the logic board because if it did, the power supply wouldn't transfer power to the hard drive...right? Any help or suggestions would be helpful. I'm about to crack it open and see if anything looks fried on the inside. Thanks.