OK guys, this should be the correct place to post this.
Recently I have been hearing strange sounds inside my PC. It sounds like a fan, kind of slowing down and almost churning, before sounding like starting up again and the sound goes. It's not a clicking or anything like that. I removed my case of my PC to hope to find where the sound was coming from, and then it stopped happening, and it dosn't happen as much now. It either happens a few times in a short space of time, or not at all for a long time, so it's rather annoying sitting there waiting for it to happen, only to find it dosn't.
However, I have now had 2 random restarts in the space of a couple of days, and they don't happen when my PCs just left running, but when i'm about to do something, like just after clicking on a web link, and just now when I opened a folder. I get no error message although there are logs in the Windows folder which say the time it happened but I have no idea what log is best to look at, as some arn't very helpful.
Any ideas what this could be?
I'm quite sure the sounds and restarts are related because I never got any random restarts before the sound started.