Sounds like eeeeeeeeee, gives me a teeny headache. Anyway, my monitor is not an lcd, I've drawn on it with permanent marker, and the sound goes away for awhile when I turn it off. Any help appreciated, obviously lol.

Have a look at this link which has some good answers;

Why is my monitor squealing?

Looks like you could be buying a new monitor soon unfortunately!

Hope that helps a little!

Lol thanks, new monitor for me then lol.