Humpalot, I think it is a ground wire also. There is ground wire already on the door, which is what threw me off. This wire looks too short to reach the door, so I thought it should go somewhere inside the machine, but did not want to touch anything.

NUG- Which one is the sound board. (pardon my ignorance, this is all too technical for my liking. Truth be known, I see all these wires and freak out lol, yet I used to work on Pc's and home theatres lol.

That loose wire should just reach around the door frame inside the cabinet and screw into the cabinet ground braid, the other end is already attached to the door.  I don't believe that your door is currently connected to ground.