Thunderbolt dark screen

[MingChen]

Macbook Pro 2015 with following specs:

16GB - 256GB SSD
Retina
2 USB
2 Thunderbolt
1 HDMI

I have no image on both of my thunderbolt display, message on the screen is Input Not Support.

When connecting 1 display on HDMI and 1 display on Thunderbolt, the system recognizes both but only the HDMI is working, the other display is blank.

Swapped cables and monitors in all possible configurations. HDMI working brilliantly. Both thunderbolt ports recognize any monitor but display is black.

Done SMC reset, problem still there.

Done NVRAM and PRAM, no change.

The 2 thunderbolts used to display on the monitor properly.

Please need help.

Thks

 

[MingChen]

Monitor on the left is connected to Thunderbolt but has a dark screen.

Monitor on the right is connected to HDMI and works fine.

Any monitor connected to HDMI works perfectly.

Monitors connected via Thunderbolt all show black screen.

Yesterday morning, all worked fine. In the afternoon the issue started.

 

[Stephen.R]

Have you tried changing input source on the displays (ie via an on screen menu)?

 

[MingChen]

Yes, I had another Macbook pro exactly same and it works.
[doublepost=1566028945][/doublepost]Just tried with my MacBook Air and it works.

 

[MingChen]

And at the same time it says that there are no devices connected.

 

[Stephen.R]

Maybe a hardware issue with the Mac, if you’re using the same cables etc and it works ok on another machine.