I have multiple OS's (2 Win7, 1 Win8.1) and on one of my Win7 OS's it boots up fine but I have no USB access to mouse, keyboard etc. It has been intermittent but now after a number of tries it's locked out.  I tried safe mode and it still happens. Any suggestions would be appreciated. The 2 other OS's no problem.
			
			 
				
		 
			 
 
		 
	 
 
		 
 
		 
 
		 
 
		 
 
		
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