I had my computer running fine the other day but it froze up for a minute. then i shut it down. now when i try to boot it up it goes to the normal screen, beeps, it goes to the windows splash screen(screen with the xp logo and loading bar) then it goes black for 2 seconds and shuts down again, and does the same thing again. Anyone have any ideas on what might be wrong or how to fix it? Thanks.