1 Reply Latest reply: Mar 14, 2013 4:11 PM by Barney-15E
tammy124 Level 1 (0 points)

I tried upgrading to Mountain Lion on my MacBook Pro. I was running 10.6.8... heard a ringtone then the screen went black. System is off and won't restart. Can anyone help?

MacBook Pro, OS X Mountain Lion (10.8.3), installation