Computer turning off

[Sirakoz]

After my CPU fan stopped working, the CPU was fried, so I had to buy a new CPU and motherboard.

The cpu is an AMD Athlon XP3000+ CPU Barton Core.
The mobo is a Gigabyte 7VT600P-RZ Socket A Motherboard.
The new fan is a Masscool Socket A/370 Cooling Fan up to XP 3200+.
The PSU is some 370W generic supply.

After hooking up everything, the computer randomly shuts down after a few minutes. It randomly shuts down in windows, and always shuts down if i'm trying to format/install windows.

When I boot from the winXP CD, it always shuts down after copying the files and says it's "starting windows setup".

Any idea what could be causing this?

 

[mechBgon]

1) you have high-quality thermal grease between the CPU core and the heatsink base, correct?

2) observe 3rd and 4th photos on this page, muy importante

3) maybe your power supply is getting ready to kick the bucket :Q Enermax, Antec, Seasonic and Fortron are some good-quality brands if you need a recommendation. Not knowing your full system specs (drives, cards, video), I can't make a wattage recommendation specifically for your system, but more wattage won't hurt anything as long as it's a quality unit.

 

[Chiller2]

Try running memtest on your Ram