Ah, right. Anyway checked mine and yes the sounder for the bleep seems to be internal to the display module, rather than from the rest of the SWS.
So whatever has caused the problem, and a jump start sounds a possibility, your going to have to take a look at or replace at worst the front display.
I think its held in place by the usual spring clips, but never had to remove mine and its reluctant to come out as I just gave it a push/pull in all directions, but has the feel of being springs holding it in place.
See here
http://lushprojects.com/bongopartsmk2/c ... 2of03.html
it looks like 4 springs on the underneath, certainly no fixing bolts/nuts shown!
I don't have the circuit for the unit, otherwise I would have put it up on the wiring diagrams, and I can't remember anyone reporting a fault before, so looks like your a first!