Came home monday during a thunderstom with a lot of lightning. Quite sure some lightning hit rather close to our house. Checked the iMac and it wasnt turning on, simple enough reason - the breaker had been switched. Switched the breaker and turned the mac on, it chimed, hard drive fired up, superdrive spun, all looked good. Except, the screen was not turning on. Turned it on and off a few times and it kept doing the same thing, i noticed that when i pushed the volume buttons on the keyboard, it made all the sounds it should, different noises were made depending on what keyboard buttin i pressed, as best i can tell, everything booted up and was working properly other than just getting no display. I have a external monitor hooked up and was getting no display on that either. I checked on my macbook and the imac was showing up in the shared directory for screen sharing and i was hoping i could connect to it and see the screen and see how it booted up, but it kept just saying connecting....... i assume i needed to give permission to share on the imac which was not possible since i couldnt see. Turned it off again and went to turn it on and got nothing, now it wont bot or chime or anything. Does this sound like a logic board issue, or a power supply issue. i am really hoping it is just the power supply has gone bad. We have had some electrical problems in our house where the breaker will trip randomly several times a week, which of course is causing the imac to hard reset quite often undoubtedly putting a lot of stress on the power supply. Ive already had to replace the hard drive which i attributed its failure to the constant hard resets. So, im just unsire if it could be that or it could be a lightening strike which hit the logic board. The imac is on a surge protector, but our cable modem wasnt, and the cable modem is not working at all. the cable modem was connected directly to a time capsule (on the surge protector) which in turn was connected directly to the imac. Could a power surge have gone though the modem and into the computer through there? The time capsule is working fine. Ive already dropped the imac off at a authorized repair center, but they didnt have a power supply to swap it out with so they had to order one so its going to be awhile before they can check that. Just wanted to get some opions here on what it could be.