I have a weird problem on my desktop computer : it seems that playing videos in full screen (with VLC or iTunes) freezes the computer after a few minutes. Maximizing vlc does not. The weird thing is that videogames, while fullscreen, do not cause the problem.
I've upgraded the video driver (ATI Radeon HD 5xxx)
A friend suggested that it could be an overheating problem, but I run bitcoin all night without any problems.
The forums talk about a "black screen of death", but only right after login. Mine seems to be while playing videos (but it recently did it while I was playing dwarf fortress)