requiem_for_a_starfury
So Old I'm Losing Radiation Signs

Okay so after my pc has been off all night I turned it on and popped a disc in the drive to startup a game and suddenly my machine sounds like there's a flymo hover mower trapped inside trying to get out. I've taken the disc out and turned it off for a while but it's still making the noise (though not as loud) when I turn it back on. What's most likely to be dying, the hard drive, case fans? And what's probably the quickest way to find out?
Cheers.
Cheers.