Hello Mac people.  I have a hopefully short and easy question for anyone willing to help.  I just acquired a 2010 mac pro (2x 2.66 ghz, 28 gb ram) as an experiment rig.  It runs pretty slow even considering it's age and I thought I would try linux on it and see if I can put some life back into it.  Maybe turn it into a server of some type, I don't know yet.  Typically, I would just put the usb installer in it, then boot to the live usb by holding the alt button during reboot.  However, all I get is a black screen.  There is no option to boot from the usb disk or even the system drive.  Does anyone know why this could be and if there is a fix for it? 
Thank you in advance!
	
		
			
		
		
	
				
			Thank you in advance!
