My 27' iMac goes dim for a few minutes on highest brightness
My 27' 2011 model iMac goes dim for a few minutes on highest brightness setting then returns, and brifely flickers very faintly for a split second at a time, its driving me crazy, never downloaded anything i shouldnt of, its plugs are all securley in place and it still has tons of memory space left in it. anyone help 😕
iMac, Mac OS X (10.7.4)