I just bought 30" ACD from CompUSA today, with the store shutting down i couldnt resist the deal they offer. Along with the purchase i bought the Apple care for the ACD. I tried to register it tonight and along with my Registration number. All i got was an error message saying my serial for the display is invalid... any one every had a similar issue... the display didn't not come in a box because it was the display model... any thoughts on this matter?