My computer has started to make an unusual, and annoying, whistling sound.
It sounds sort of like a very high-pitched, rapid morse code message being transmitted via radio, but it doesn't seem to be a coherent message. It isn't terribly loud, although when it is quiet in the room it can be heard from 15-20 feet away.
I can't tell what part of the computer this sound is coming from, or if it is associated with any particular processes being run. It can be heard frequently when we aren't using the computer, though.
Any ideas about what might be causing this, and if it can be fixed?
Thanks in advance,