[HELP] Apple iMac 27 Black Screen / Screen of DEATH Problem

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My iMac 27 (11,1) from late 2009 with i7 20gb rams and fusion drive won't let me sleep. i don't want to buy a new one, because this iMac is really great and works pretty good! BUT this black screen problem kills my neck.
I hope anybody of you can help me!

Regards from Germany!!!

Видео [HELP] Apple iMac 27 Black Screen / Screen of DEATH Problem канала Ohhh Sssht