I'm going to point out some obvious problems I've seen when people do board swaps and run into trouble.
1. No stand offs under board.
2. Stand offs where there is no holes on the board.
3. Mis-aligned board causing a bend in board.
Keyboard and mouse not working: Since it's PS/2, make sure you didn't plug into the wrong ports. It will fit in either one obviously, but will not respond if backwards. Check the pins on the plugs to make sure you didn't mash any of them up and they are just bent over to the side in the plug.
