So Adrian,
Is this a fast click click at the same speed that the CD is spinning
and not in the speakers (something with the motor or drive) or a
slower random click in the speakers (something possibly in the power
supply)

Took the Sharp apart - but couldn't see anything obviously
disconnected inside - does everything it should but the flourescent
display is blank...

Is it a flourescent glowing display ( check voltage on the display
module itself often marked on the pc board.) or back lit LCD display (
possible blown bulb)

Richard