WHY DOES MY COMPUTER STOP WORKING AND TURN DIFFERENT COLORS???!!!

I will start up my computer and it will work for 2-15 minutes and then all of a sudden turn different colors. It will go like blue, green, red, white, and then repeat the colors. This happened to my friends compuuter and she ended up having to get a new one. uh oh...
Please Help!!!
Using Mac OS X 10.4.4
on iBook G4
THANK YOU!

Hi, t.o.
To check for video problems, run the Apple Hardware Test that shipped with your Mac. It will test your display/graphics card as well as other hardware bits. See my "Apple Hardware Test" FAQ for comprehensive advice on using the Apple Hardware Test in troubleshooting, including running the test in Loop Mode.
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X
Note: The information provided in the link(s) above is freely available. However, because I own The X Lab™, a commercial Web site to which some of these links point, the Apple Discussions Terms of Use require I include the following disclosure statement with this post:
I may receive some form of compensation, financial or otherwise, from my recommendation or link.

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