Computer rebooting randomly(possibly video card?)

[me(who else?)]

I'm trying to repair a computer for a friend, who claims that it has been rebooting
after (moderate) use. She says it's giving a BSOD, but I have yet to get the same error. She got the computer from an absolutely horrendous store in Kingston. It has a few modifications from the base model (GeForce 5200+, extra case fan), but it's pretty much the same computer. I suspect that they didn't upgrade the PSU, and that there may be a problem with the Video Card not getting enough power. The specs are:

ASUS A7VBX-MX mobo
AMD Athlon 2200+
GeForce 5200+
1 HD
1 CD-ROM drive

 

[BrownPaper]

i have never heard of a gForce 5400+. is that right?

i always check if the ram is going bad first. use Memtest86 to check for memory errors. i run memtest86 for at least 12 hours continuous to check new memory.

 

[Loucifer1]

A CPU heating issue? Maybe the bios is shutting it down because it heats up and triggers the automatic shutdown at a certain cpu temp? Maybe the heatsink on the cpu needs cleaning? Or is there any thermal paste between the CPU and the heatsink?....Just a thought...hope this helps out.