Hey

I have yet another problem with my PC, and I think its hardware related. I recently formatted my PC so I have started from scratch (my pc kept freezing). I found out that the second slot for my RAM on the motherboard is not working and my RAM was fried. I have a 1gb stick of RAM in the first slot and 512 in the second (the pc says I have 1.5gb RAM but i think its only using the 1gb). The problem the PC freezes when I run games or soemtimes when the system just idles. It happens randomly.
When freezes it either goes into sleep mode and i cant get it out of it, the screen goes a weird colour and it is adjusted so the screen image is halfway out of the screen, makes a screetching noise from the speakers or just simply freezes.

I have no idea what the problem is. Any advise on this? Thanks in advance.

AMD 64 3000+
ATI Radeon 9550 256mb