OMG - I don't have advice - but I feel your pain. Are you ok to open the top and see if that connector has popped off?
In particular - Standing at the back of the unit, with the top off - In the middle of the unit at the front there is a wide ribbon cable - To the right of that there's another ribbon cable - Also on the left hand side, there's a little input board that houses the instrument and headphone jack - There's a ribbon cable from that.. My money's on the cable that's on the front in the middle but what would I know?
Hope it's a simple fix
Pauly