2 Replies Latest reply: Feb 24, 2013 12:52 PM by patrickfromwalsall
patrickfromwalsall Level 1 Level 1 (0 points)

I have just purchased a second hand 24" cinema display to use as with my 27" iMac as a twomonitor setup.

Connected it up and weked fine fot two days.

Now it keep flashing on & off never more than a fraction of a second.

I connected it to my MacBook Pro for about an hour and the problem did not appear.


I also tried the other Thunderbolt socket, still happened but not as often.


Any one an idea, hardware problem of software?



iMac (27-inch Mid 2011), OS X Mountain Lion (10.8.2)