Anybody good at computers

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Ok, guy (and girls) i need some computer help. So my computer wont start up it does the normal stuff like shows the windows 2000 screan then the box pops up saying its applying security polices and stuff. Then I think right before the login box the screan just goes all crazy. It goes like that sycadelic stuff, and control alt delete doesnt work.
My brother took the hard drive out and put in a differetn computer and did scandisk with it and it said it was ok. But he says it could still be windows that is broken or the mother board. He says i should just buy some new part but i cant really aford the money to just buy stuff. Anyone know how to tell exactly what the problem is? Anyone actuly read all that and understand what i said? lol

Thanks people

I've encountered this before, but I don't remember what I did to fix it. It's most likely software related. Try booting into safe mode and reinstalling or rolling back your video card driver.

Ok we managed to get it figured out. Well one of my brothers friends did anyway. Like as soon as he started looking at it he was like whats that noise, it had been makeing a noise like camera flash. Anyway, the switched power supplies and it worked. So im guess im buying a power supply.
Oh just fyi safe mode didnt work either. and I was checking my email when it stoped

Thanks for you help.