Thunderbolt Display not connecting external Video on MacBook running OS X 10.11.5 Beta 4

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Created May ’16

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Anyone notice that Thunderbolt Displays are not connecting to GPU / Video channel when plugged in? I'm runing into this problem on any Thunderbolt Display I connect my Late-2013 MacBook Pro running latest OS X developer 10.11.5 Beta 4 (15F31a). This seems to only now be broken in Beta 4. Previous builds are running fine.

USB and Ethernet ports on the Display seem to be connecting fine over the Thunderbolt connection. Video is the only dead channel.

Answered by Mattical69 in 137223022

RESOLVED: Re-ran SMC and NVRAM resets and the system is now fully recognizing the Thunderbolt Display and all ports are functional. 😀

NVRAM Reset

Shut down the computer.
Hold down Command, Option (left side), P and R keys while you switch on and continue holding them until you hear the restart sound a second time.

SMC Reset

Shut down the computer.
Plug in the MagSafe power adapter to a power source and to your computer.
On the built-in keyboard, press the (left side) Shift, Control, and Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.

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Answer 1

Mattical69 OP

May ’16

Accepted Answer

RESOLVED: Re-ran SMC and NVRAM resets and the system is now fully recognizing the Thunderbolt Display and all ports are functional. 😀

NVRAM Reset

Shut down the computer.
Hold down Command, Option (left side), P and R keys while you switch on and continue holding them until you hear the restart sound a second time.

SMC Reset

Shut down the computer.
Plug in the MagSafe power adapter to a power source and to your computer.
On the built-in keyboard, press the (left side) Shift, Control, and Option keys and the power button at the same time.
Release all the keys and the power button at the same time.
Press the power button to turn on the computer.

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