my computer is not working properly. i have windows 7 ultimate 32 bit,core 2 duo processor. i have cleaned my processor fan,RAM. i have also tried to another slot of RAM but still its not working.. whenever i start my computer sometimes it starts working properly for 2-3 min. it shows desktop screen and then suddenly processor fan,cpu fan,smps fan everything get stopped(like shutdown)... i don't know why it is happening.. i also try to start my computer with safe mode..but still its giving same problem..