My unit say's no discs as well so I presumed it's laser had become unaligned and a mate said if you get it realigned it will only last about three days and when you go over a decent bump it will go out of whack again. Grant, I pulled the unit out and I noticed that the cables plug into the bottom of the shuttle with two with two little black plugs, so all the BMW Shuttles I've seen on trademe have cables coming out the back of the units with one dimm/din plug and one white plug. So do I need a specific unit.