Hi, Over a year ago, I bought an iMac and AppleCare but never registered / installed it. I'm selling the iMac, and just making sure there won't be a problem. The purchaser can just ring up Apple and give them the serial number and it's all fine and dandy right? I've got the "Web Registration Instructions" manual here and it seems to imply that activating it now simply prevents delay and doesn't stop you from using it. Now, I am selling this machine... should I activate the AppleCare now, or let them do it?