Its probably not enough power and your power supply is a genaric one, You should have bought a pc power and cooling, antec, enermax, or ocz psu.
Originally posted by sayaprayer
Edit: My PC started up for about 10 minutes. Windows booted and everything. First thing I did was try to burn my important documents to a CD (just in case :P). But shut off again part way through. If it is my PSU, how can I tell? [/B]
Check voltages with a multimeter or in the bios if its off more then 5% it could be causing this.
It will also tell you temps.