iMac 2011: Black screen after ~10min of usage.

Hi everybody

The main screen of my iMac 27" (2011)  goes black after ~5/10min of usage!

The system is running and I can still work with my two external monitors.

When I’m pressing shift + ctrl + eject (logout) and space to wake it up, the screen turn on again!

  1. I installed fan control and all the temperature sensor are below 30° (86°F)
  2. Fan don’t spin on high
  3. It’s not the graphics card, external monitors are still working.
  4. By holding a flashlight up the screen I can see my desktop Icons.
  5. In Safe Mode the problem persists.

Could the problem come from the Inverter or is it just a software problem?

Any advice would be appreciated.

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