Chosen Solution
Hi, I updated my Mac to a 32 GB and a new CPU and a new logic board everything was working well when I put the screen back I connect to the computer by TeamViewer remotely from a second system everything looks good but the screen is black. I can play YouTube’s the rest of the system is working good, it’s only the screen all the cables are connected. What can be the problem thank you In ‘About This Mac’ Looking at the display Tab - No information found.
The machine icon you selected has a maximum RAM capacity of 16GB. To verify which exact machine you have, please look on the bottom of the iMac stand. Your serial number can be input here and you can then tell us your exact machine: https://everymac.com/ultimate-mac-lookup… Also please tell us which CPU you installed.
Plug in an external display via the DisplayPort connection on the system. Do you see an image on it? If not the GPU board has failed. If you do, the display cable and/or logic board connector for it has become damaged.
