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Question: iMac screen goes black after TDM

Hi


My iMac 2013 goes black when disconnected from my MBP in Target Display Mode. I have tried unplugging the cable and CMD+F2, No difference.

I can hear it run and share screen to my MBP from “share screen” in Finder on MBP. I can use the mouse and keyboard, but there is no way i can get the screen back on.

Both systems is 10.13.1.

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Nov 16, 2017 3:55 PM in response to makaus In response to makaus

Hmmmm.....


Disconnect the setup and all other external devices from the iMac except for mouse and keyboard.

Reset the iMac's SMC, as per > How to reset the System Management Controller (SMC) on your Mac - Apple Support

and the NVRAM, as per > How to reset NVRAM on your Mac - Apple Support

Then re-connect the Mac's and test it by entering, using and exiting TDM.

Nov 16, 2017 3:55 PM

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Nov 18, 2017 4:46 AM in response to makaus In response to makaus

Talked with them again, in the end i talked with a Senior, who will try to talk with an Engineer now.


Waiting for them to talk with the Engineer.


This time we tried with safe mode and a new admin user.. nothing :-(

Nov 18, 2017 4:46 AM

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Nov 19, 2017 6:40 PM in response to makaus In response to makaus

Its 10.13.1 there is broken.

Mountain Lion and Sierra works.


Other users on Apple forums also have a lot of Thunderbolt problems with 10.13.1.

Nov 19, 2017 6:40 PM

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Question: iMac screen goes black after TDM