You know how on old TVs, when the screen would go out, and you'd have to whack it a few times to get it to come up again? (I'm only 15 how would I know that?) Well, that's whats happening to my Plus. It will run fine for about 10 or 15 minutes, then just go black. After a few whacks, it would come up. But the simple action of inserting a floppy makes it go out, and even gently tapping on the side makes it flicker. I opened it up and tightened the screw on the tube, (not sure if that would help) but, no luck. But my dad says it just may be dusty. Any suggestions?