Hello,
A couple months ago my computer started freezing up randomly. For example I would be working in Photoshop and it would freeze in a very weird way(see photo). The same thing would happen when I'd be watching a video on Break.com or something of that sort. The way it freezes as you can see in the picture is it would become unresponsive to mouse and keyboard, sound would stop.
The horizontal boxes would be shaking up and down across the screen. Sometimes also, the screen just goes black.

(the photos were taken with my cell phone, sorry for the quality loss)
I've tried reinstalling XP twice. Nothing. I've bought windows xp pro and installed that. Nothing. I'm pretty sure it's not the monitor either. One time when it was frozen I switched the monitor with my old one and it was frozen in the same way.
I'm running on:
Computer:
Compaq Presario S5000NX
Intel Celeron CPU 2.50GHz 2.49 Ghz, 504 MB of RAM.
System:
Microsoft Windows XP
Professional
Version 2002
Service Pack 2
Please help, this is really stressing me out. Whoever can solve this for me will receive $20.00 US through paypal.
Thanks,
Luc