I updated my iMac to 10.12.6. As soon as iMac restarted after the update was finished, the screen went off.

I tried to connect it from another mac using screen-share, and I was successful. I noticed that system is running normally except for the screen which is off. Using screen-share, I can access internet, connect bluetooth devices, print… etc, but the screen is off.

System report shows me "No information found." under Graphic/Display.

I can't run system restore, because screen never goes on during the boot cycle.

Any help would be greatly appreciated!

Hardware Overview

  • Model Name: iMac
  • Model Identifier: iMac12,2
  • Processor Name: Intel Core i5
  • Processor Speed: 3.1 GHz
  • Number of Processors: 1
  • Total Number of Cores: 4
  • L2 Cache (per Core): 256 KB
  • L3 Cache: 6 MB
  • Memory: 8 GB

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