hi guys, i have already lost lot's of hair during this issue so i gave up and now i need some help fron u .. 8 days back in a evening i had played world of warcraft for 3-4 hrs then i shut doun my pc took rest for an hour and switched on my pc, since then the problem started. When i turn on my pc cpu and other fans spins for 3-4 seconds then the pc shutting down. That night i had tried several times but problem persist. Next morning when i switched on the pc booted smoothly and went to desktop but after 30-40 mins it shut down automaticly.(nt like power failure, it's like, when u press power botton in a running pc it shut down so quickly, pc shut down like that). I took everything off now only mobo, cpu, ran and psu is connected, switched on but same problem. Cpu fan spins for 3-4sec then pc shut down automaticly. But after a long gap when i turn on my pc it is running smoothly for 30-40 min then it shut down automaticaly like i told before and same prob happening !! Pc is nt staring cpu fan spins for 3-4 sec then it is shutting down !! cpu temp is arround 45-50. so i think it's nt the heat issue. So what is the prob ? Any suggestion is welcome .. Thanks in advance.