For a while now theres been a slight 'humming' noise from inside my PC. It seems like a tiny loose screw or something similar vibrating. If i put a small pressure on the top of the case the sound dissapears, but returns fairly quickly.
Iv read up a little on this and often is a screw a little bit loose, but i dont have a anti-static wrist strap.
any ideas wheres best to start 'tightening'?