ok this is my problem.. built a computer for my bro and it worked perfectly for 2 months, then one day he told me that it suddenly had frozen up while he had been listenin 2 music, and when he tried restarting it, nothing had happend.. so now everytime i try to turn it on, all the fans start up, all the little leds light up, the disc and hard drives do their warming up sounds, but after that... nada! screen stays in stand by mode, and all i got is a computer with spinning fans.. ive allready tried reseting CMOS and stuff like that but no change.. please help! what could be wrong??