Ok where do I begin I got this mac from a friend that upgraded to the new mac pro  he said it worked  s9 I took his word for it so It home and I get it home All I get is. The flashing folder with the question mark I have tried everything from different operating systems and I don't know what to do please help
	
		
			
		
		
	
				
			 
 
		 
 
		 
 
		