Nope definitely not, however since I posted I have noticed it is making the noise without the fan moving. This has been a problem for a while a I just noticed the two were occurring at the same time, which may or may not be a coincidence and I jumped on it and posted here.
The noise itself is a high pitched whine/beeping almost, and I'm having real difficulty finding the cause of it. It seems to occur when I move or scroll the mouse at times, which lead me to believe it could be CPU related, but then why would the noise be coming from lower down the machine? It just doesn't make any sense to me. Maybe dodgy capacitors?
I realize that I'm throwing questions at you and not giving you much to go on, sorry.
Edit: I can confirm that the PSU
is making the beeping noise when the fan spins, the noise I'm hearing from the mobo is a separate issue I think.
Also, the noise occurs even when the fan twitches, there is no airflow for anything to get caught in to my knowledge.