You *may* get it to work for a while, but you would need to replace all of the bad capacitors (I would suggest all of them), any chips that have been corroded, anything that is missing and you would really need to get the rest of the rust off (I would suggest doing that with an eraser). And even then it would probably be on its last legs.

But if you want to give it a jab and you get it to work (And have it work for a while) it would make one heck of a success story. But again, I wouldn't get my hopes up. Your best bet is getting a new motherboard.