Macbook Pro 15 Retina goes Blackscreen


RJ172

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Hey Folks,

all of a sudden my Macbook Retina started to go blackscreen in different occasions and utilization and I cant find the reason why.
The Keyboard is still working and lights are glowing. I tried HDMI but the other display stays black as well, so I thought it could be a problem with graphics. Searched drivers, checked system, compatibility... Everything shows supported and up to date.
I´ve got the NVIDIA GeForce GT 650M and Intel HD Graphics 4000 installed in this mac, which been working fine since ever, as they already did on Mojave.
I didn´t checked if the camera is still working when the macbook goes blackscreen, though I doubt.
Quite a few times it took a few restarts until the Macbook started booting without a blackscreen again, but switched back to blackscreen pretty much in the middle of the booting process. Sometimes it does just fine, working fine for an hour or two and then goes blackscreen again for no reason that comes to my mind.
I already checked the hardware and everything seems fine to me, unless there is some electrical short happening I haven´t seen yet.
I also erased the SSD, reinstalled Mojave (same issue), reinstalled old backup when everything been working fine; also Mojave (same issue). I didn´t tried High Sierra.

I would be very thankful for any advice what could be the matter!
If helpful, I can post the report the Macbook shows when I reboot.

Macbook Pro Retina 15 Early 2013
2,4GHz i7
16GB 1600MHz DDR3
NVIDIA GeForce GT 650M 1024MB + Intel HD Graphics 4000 1536MB
256 GB SSD Drive

Hope somebody got an idea. I don´t.
 
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