today i was playing CS. suddenly pc shut off. It was like as if someone just pull the power plug on my machine. then i again pressed the power on button but nothing happens. after that i opened up the cpu casing to check that if the PSU is working or not. the psu works fine as i can see the green led light in the motherboard when i plug on the power. but i noticed that when i press the power on button from cpu, both the casing fan and the processor fan works for 1sec then it stops working. i am not getting anything of this hint.