My Pontiac G5 GT is not making any sounds anymore. From the radio am,fm,xm,cd and aux. It is very boring driving around with no music at all. Also all the sounds from the signal lights, fuel light, when doors are open and even when i leave my lights open there no sounds at all. I checked all the fuses and also I checked every speaker in the car except the subwoofer. GM is telling me that they never hear any problem of this kind. I'm traveling 1000 km a month, I need this problem fixed soon. Hope somebody can help. thx