The fan that you can see (behind the metal cage of course) at the back of my desktop is making insanely loud noises. This happens now and again but when it starts it takes ages to stop. Usually if I blew the fan really hard it would stop, or I shamefully gave the computer a gentle kick on the side it would also stop, but that doesn't seem to be doing much anymore.
This isn't a result of an overheating computer or anything like that (I don't think), as sometimes the fan does this a few seconds after the computer being turned on.
Does anyone have any ideas why this is and how do I stop it?
Cheers.