Seems like the first thing to go on laptop-like devices is the screen, but I don't see any replacement parts on eBay. ...not that a hypothetical replacement would be easy in the first place. Just reading an FAQ on replacing laptop screens gives me a headache.

It's really easy to mess up repairing electronics. For instance, my PSP joystick still pulls to the right even though I'm on my second replacement.
Have you ever fiddled around with stuff like that?