The inner workings

Have spent another evening trying to get the damn computer to work properly. It hasn't really behaved itself since the hard disk crashed a few weeks ago, but now it seems to be the DVD that is playing up. Keep thinking that it's sorted out, then the next day it starts playing it's silly games again. Fingers crossed this time it behaves itself - I am fed up of taking the side off the case and looking in the dusty interior. Still, it gave me a blip tonight...