I think my video card is melting down?
During the last few days, my monitor will abruptly display rows of blue gradients. This will usually last about a second and the computer is either usable thereafter, or it does it again a few times and eventually freezes up. One time it made the blue screen appear. This happened right after I was playing Call of Duty 4 for about an hour.
It's an ASUS Radeon 4830.