hard lockups

I'm having a problem here and I haven't done anything that would cause it. Well my suse install is locking up so hard that I can't move the mouse, hit ctrl+alt+del, or anything. I leave it and come home from work and it's locked up. Any ideas? I have to actually hit the reset button on the system. THanks -- Jason Pratt themadtux@tampabay.rr.com Registered Linux User # 334419 Registered Linux Machine # 219697