4 Replies Latest reply: Jan 25, 2013 5:59 PM by daleb7
daleb7 Level 1 Level 1

My imac 27  inch screen occasionally dims down and or goes black but does not turn off, does any one know what this could be, think I am off warranty now as well.

iMac (27-inch Mid 2011), OS X Mountain Lion (10.8.2)
Reply by leroydouglas on Jan 24, 2013 11:06 PM Helpful

Try resetting both the SMC and PRAM






If no change I would suspect a hardware problem, like  LED backlight boards, possible cable failure, etc.

I would take it in for repair, or genius bar consult and diagnostic.





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