I think with two systems you should be able to to get enough parts to make one working one. Get those batteries out and give everything in the area a thorough cleaning. You'll probably want to add a new hard disk or one of the various CF solutions instead of messing around with your old drive.
One other thought: acill's got a point about A2000's still being fairly cheap. If yours are both 4.x series boards I wouldn't sink a lot of time into them, look for a good working 6.x revision board, instead.
A2000's are almost always fixable though, good luck!
