sorry I got in here too late, I see you blew compressed air but did you check your cpu's heatsink? after a while they get so clogged with dust you have to remove them and clean them by hand. sounds like either your cpu blew, or a capacitor on the mb, or possibly one on your vid card. heck, I hope it's your mb, they are cheaper to replace than either a cpu or a vid card. good luck bud.
