Computer freezing problem :o(

Miscellaneous Forums/General Discussion/Computer freezing problem :o(

Hi there, i'm having real problems with my computer freezing and just locking up. I'm not sure what's causing this, but my guesses are either memory, or motherboard. I thought it was the heat causing the issue, but, now the ambient temperature has fallen and is nearly back to normal here, it can't be that...

[EDIT] Also, since this is happened, i've noticed the screen has become slightly corrupted. Most of the graphics have slight artifacts round them, the same kind you get when you save a jpeg on low compression. I wonder if this is related, or just caused by the constant freezing...

Any ideas?