This has been going on for several months now and its really getting on my nerves! In order to get the screen to work i have to press the "power on/off button", but it usually get´s black again within 15 minutes.
I have checked all screen resolutions and it seems like its normal. In the meantime I have to use a exsternal screen, its the only way I can use my IMac as ¨Normal¨
IMac 27" OS X 2011
Version 10.8.5
Prosessor 3.1 GHz Intel Core i5
Memory 4 GB 1333 MHz DDR 3
