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My Mac is working but it has a black screen

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.

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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.

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In about my Mac I went inside display and I see no information there so I went back to my ‘About This Mac’ and the computer detect the screen is 23” I have a 21.5” Why detect a 23?

Of course by connecting by team viewer because the screen doesn't work!

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TeamView only shows the CPU and its support logic is working (virtual display). It does no test the internal GPU or the internal display or its connections physically.

You need to physically connect an external display (via DisplayPort connection) to prove if the GPU is really working.

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Now I see when I do about my Mac I don't see the line graphic AMD random HD 6770m 512 megabytes is not there mean it doesn't detect any graphic maybe the graphic card is did?

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@baksimcha - Any news? Did an external display work?

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Hi I disconnect everything I reopened the Mac I changed the graphical put everything back the Mac Boot up everything is normal but no screen in about my Mac no graphic card information

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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.

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I7 860S

32 GB of 1333

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I build a custom made mec

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