Computer randomly reboots

Ok it's more than randomly rebooting.
The monitors are also turning colors such as the girl on my wallpaper's skirt. Please help me.
http://img457.imageshack.us/my.php?image=untitled7qd.jpg
I'm using a ATI Radeon 9800 Pro.

 

Hrm.... are your graphics drivers up to date? Also, is the card overclocked? It may be overheating... thats what my comp did, shut down automatically when it got too hot so i upgraded my cooling situation.

 

Drivers up to date. Not overclocked.
Case is cool.

 

Help please.

 

May be your power supply

 

I don't think so, I've had this card for over 7 months. It just recently started to do this.

 

The girls skirt shows up fine on my PC....

 

if its got a oem vpu on it...then its about time for it to be going lol....im running a 9800 pro also and ive had so much trouble with it its not funny but thats my fault because I overclocked it till it go so darn hot it burnt my fingers when I touched it...and thats with a zalman cooling fan on it