12-30-2012 11:05 PM - edited 12-30-2012 11:06 PM
Have you tried a battery pull? I'm hoping the key isn't physically stuck.
12-31-2012 04:11 AM
As suggested a Battery pull is enough to release the NUM lock , You can try pressing alt + left shift ( ^ aA ) it also releases NUM lock , If that does not work then I think the problem is within your Keypad.