No stereo as in no power at all - or just no sound.  I have had the latter a few times and I understand it is a "safety" measure when the battery is down - you sometimes get the low power message but this happens when the battery is even worse.  
After the car has been running for a while and you switch off and back on the radio comes back.
If you have no power to the unit at all then I would be checking the relevant fuse/s.
Garry
				
			 
			
		 
			
				
			
			
				REMLR 243
2007 Range Rover Sport TDV6
1977 FC 101 
1976 Jaguar XJ12C
1973 Haflinger AP700
1971 Jaguar V12 E-Type Series 3 Roadster
1957 Series 1 88"
1957 Series 1 88" Station Wagon
			
			
		 
	
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