It might not be a complete answer but I had to change my LED Driver Board when my display went black ( as if the computer was in sleep mode ) as soon as the computer was on. I had to push the power button to get the screen back multiple time. There was also a problem with the graphic card but even after changing the GC, the screen would go black. We figure it was the LED Driver Board when we realized the computer wouldn’t show anything on an external monitor. Hope it helps :)
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