Gday all.PC keeps spazzing out .. overheating?

[sicks]

Hi all.
Im extreme pc nublet please bare with me.
Lately my pc has been spazzing out when I play any games with decent graphics.By spazzing out I mean Ill be in the middle of a game everything working fine then whammo pc just go skitz.. black screen non responsive.
Anyways after snooping around the forums I found out how to do a temp check fan check etc..

The voltages seem fine but 1 thing I have noticed is that the cpu fan is fine but the chassis fan says n/a.

could this be my problem?
What sort of fan//parts will I need to get to fix this?

Pc specs are.
2.8 gb cpu
asus p4s800 mobo
512mb pc3200 ddr-sdram
fx5200 vid
sound blaster audigy
no idea on psu

thanks in advance

Sicks

 

[vegasgmc]

Try gaming with the side of the case off and a large fan blowing into it. That helps nail down a heat problem. Also get a some compressed air and blow out the fans and power supply and check the video card fan. The 5200's run hot and have a very high failure rate. A cheap or under powered power supply can also cause those problems. Also update your video driver.