This is an odd one. Very occasionally, my computer will restart itself with no warning. It doesn't shut down correctly, it just goes straight to black screen and then the BIOS loading screen. It's usually when a game is being played or being started up, so I wonder if it's related to load. I'm pretty certain it isn't an overheating issue though. It sometimes happens when the computer has only just been started up for a start. And when it happens, it instantly restarts, and then has no issues at all. Are there any other general issues which could cause this behaviour? It's actually been happening for months, but I've never got around to doing anything because it is so infrequent.