I have just had both rearsuspension air-bags renewed. The garage said the battery had gone flat while the car was in with them. When I collected the vehicle the Sat Nav display flickered and the went all white, plus the CD/Radio is displaying and playing ok but there is no sound from any of the speakers. I have checked fuses 1 and 8 in the side of the driver's seat but tehy are ok, any ideas? Cheers Smiffy