This is a rather unusual problem and haven't seen a post about it anywhere before but hopefully someone can help me.
If my machine runs at 100% CPU usage for any length of time, it shuts down. My processor is an AMD Athlon XP 3000+ running at 2.1GHz. My motherboard is an Asus A7N8X-X and I have 512MB RAM. I'm running Windows 2000 Professional and Mandrake Linux. This problem occurs with both operating systems.
If, for example, I'm importing music from a CD into iTunes, my CPU usage goes to 100% +/- 5%, my screen shuts off first, and then my machine turns off. When I push the "on" button, it starts, doesn't POST and shuts down. If I push the "on" button again, it POSTs but my CPU speed is 1GHz. I can go into the BIOS and exit immediately and my CPU speed is back up to 2.1GHz. Same thing happens in Linux. If I'm running some code that takes up a lot of CPU time, the whole thing goes down.
For a while I thought it might be the CPU overheating but I downloaded the Asus Probe and it shows my CPU running at 50C +/- 10C. Someone suggested that my motherboard jumpers could be set incorrectly but I'm not sure if this is it or not.
Does anyone have any suggestions as to what could be causing this? It's really affecting my work as I can't run any proper programs.