Hi guys, I woke up this morning and came down stairs to check my computer and all i could hear was the loud screeching noise, i thought a cd was stuck so i pressed the eject button realy hard and screeching noise stoped but then whilst the tray was out it came back on so this time i just tapped preety hard on the case and it stoped again.

Does anyone know what is causing this noise.

Its a dell e520