computer powering off quickly

[einstein]

i am having a computer which powers off (i don't mean shutting down) , when i do video conversion or watch movies/videos , it does no happen regularly but happens in random times , i uninstalled all the codecs and chipset driver , and i re-installed the chipset driver , so i don't think it is a software problem , can it be a hardware issue of the motherboard or the atx power supply ???
have anyone else faced it ??
if yes what measures did you take to solve the problem ??

 

[(*steve*)]

Take a look at all the heatsinks. You may have one or more of them clogged with dust. This happens mostly on heatsinks with fans attached. Also the fans can seize -- make sure they turn freely when off, and spin when the computer is turned on.

 

[jerryg50]

It sounds like you have a failing power supply, or a card or device in the computer that is pulling too much current, and the power supply is going in to protect. The most common fault is the faulty power supply.

Jerry G.