I just tried to turn on my Mac and I'm having some problems. when I try and turn it on, I don't here the chime, the screen doesn't turn on, and green light on the front doesn't turn on BUT I can hear a fan running and some sort of drive or something working. I took out the logic board and see no physical problems that I'm aware of. also, last night there was a HUGE lightning strike that made even a recorded program on my DVR go fuzzy - which has never happened before - and I'm wondering if this effected my Mac but I didn't think it did at the time as I turned it on after the strike and everything worked - I still left it unplugged for the rest of the night just to be safe. but today when I tried to turn it on I got the "Welcome to Mac OS" screen but even after while it didn't go to the start up screen, I then shut it off with the switch on the back, I then tried to turn it back on and got the problem I presented you with at the beginning. please help!