I have a problem with my nsm gp2 CD jukebox. No error messages. Everything will work fine until it actually starts to play music and the fan kicks on. At this point the popular display four 7s, one at a time. It repeats this continually until the song stops. Also while it's doing this the rear motor on the magazine title box lightly flutter back and forth. This happened once before and just went away but now it looks like it's permant. I don't know much about electronics so any help would be greatly appreciated