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err message on chevy tahoe, continual wizzing noise every 5 seconds?

Our car stereo was working fine, one day the lights flickered and when the cd popped out the err message lit and it has a continual wizzing noise about every 5 seconds, even when the car is turned off. It caused my battery to run down because it seems to be stuck in this continual mode? help!
No nothing about cars girl, August 2009