"Ever since we got the new computer, we haven't been able to get the old mouse & keyboard to sync to the old computer...they keep trying to sync up to the new one."

How does this person solve this problem? Both computers are iMacs, The 'old computer' is running 10.5 and the 'new computer' was bought last week. They cannot even turn the bluetooth on and off on the older iMac because they do not have a corded mouse.