|Here is my main problem, which happens on BOTH Linux and Windows XP:|
When I do something CPU-intensive, within a few seconds or minutes the PC just shuts down.
The power light stays on, but the system is shut down, and the only way to turn it back on is to unplug the power cord for a few seconds, then plug it back in, and then turn it on.
This problem ALWAYS happens when I try to convert a video file, but sometimes I could just be watching an XviD movie, and it'll happen within about 5-20 mins.
I've tried searching online for people with similar problems, but found nothing.
I've tried enabling or disabling SMART Fan in the BIOS.
I put in a new CPU fan about two months ago.
I've tried uninstalling and re-installing software.
I've tried removing my video card to use the internal video, but it still didn't make a difference
I've even tried unplugging all hard drives and running Linux from CD, and STILL the system shuts down when I try to convert video.
I've tried taking out one stick of RAM, then the other.
This really puzzles me, because I can do regular tasks like browsing the internet, managing files, burning data DVDs, so I really can't trace what the problem is.
If it were a faulty motherboard, would I still be able to do the things I'm doing?
The only remaining piece of hardware I can think of that could be the problem is the power supply.
I want to be 100% sure that that's the problem before going out and buying a new power supply.
I forgot to mention my system specs:
Intel Pentium 4 3.2Ghz CPU
ECS Elitegroup motherboard
2 DVD burners
Nvidia 5200 graphics card
USB 5.1 soundcard
Western Digital HD 320GB
Maxtor HD 200GB
Currently using Ubuntu 9.04 (Linux), but not that that matters, because this is not an OS problem.