2 Replies Latest reply: Nov 20, 2012 2:01 PM by robinfrombirchington
robinfrombirchington Level 1 Level 1 (0 points)

?My iMac (mountain Lion) begins the start process but the rotating cog stops after a short time and the screen begins to flash and alternates between black screen and blackck screen with three grey bars.  has anyone else had to solve this problem please.


Mac Pro, Mac OS X (10.6.7)