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			Gremlins!  Mine (2003 S with the same unit) has twice just not given any volume, even though the display worked; the various bands changed; and it had worked right before I shut the car off.  Subsequent restarts and all seems back to normal.
		 
		
		
		
		
		
		
			
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				2003 Boxster S Dark Teal
			 
		
		
		
		
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