Thunderbolt ports and HDMI not working simultaneously on my MacBook Pro

Created at: 2021-05-25 05:54:20
Questioner General

I have a MacBook Pro (Retine, 13-inch, Mid 2014). It has 2 thunderbolt ports and 1 HDMI port.

The 3 ports have worked simultaneously in the past connected to 3 external monitors all at once.



The current situation is:

I can connect whatever 2 ports to 2 external monitors. However, whenever I try to connect a 3rd external monitor to the additional port (whatever this port is - Thunderbolt port A, Thunderbolt port B, or HDMI), one of the Thunderbolt port gets disconnected, thus I can only use 2 out of the 3 displays I have.

This never happened in this past.



Things I have tried:

  • Testing each cable individually to make sure it works
  • Testing each port individually to make sure it works
  • Reinstalling macOS Bi Spur 11.2.1
  • Reset SMC
  • Reset NVRAM/PRAM
  • Enter Safe mode and see if the ports issue still exists in Safe mode



Nothing has worked so far.

Can someone shed some light on the matter?



Cheers,

Marcelo-Motta









Answer #1:

By: Myriam Effertz V

I have a MacBook Pro (Retine, 13-inch, Mid 2014). It has 2 thunderbolt ports and 1 HDMI port.

The 3 ports have worked simultaneously in the past connected to 3 external monitors all at once.



The current situation is:

I can connect whatever 2 ports to 2 external monitors. However, whenever I try to connect a 3rd external monitor to the additional port (whatever this port is - Thunderbolt port A, Thunderbolt port B, or HDMI), one of the Thunderbolt port gets disconnected, thus I can only use 2 out of the 3 displays I have.

This never happened in this past.



Things I have tried:

  • Testing each cable individually to make sure it works
  • Testing each port individually to make sure it works
  • Reinstalling macOS Bi Spur 11.2.1
  • Reset SMC
  • Reset NVRAM/PRAM
  • Enter Safe mode and see if the ports issue still exists in Safe mode



Nothing has worked so far.

Can someone shed some light on the matter?



Cheers,

Marcelo-Motta









Answer #2:

By: Jailyn Bartoletti

Hello Marcelo,



It sounds like you are experiencing an issue connecting multiple displays with your Mac. We understand how important this is to you and we are here to help.



Currently your Mac only supports 2 external displays at once. More information can be found here: Use multiple displays with your Mac



Specifically the section titled "Connect the displays."



Cheers!

Answer #3:

By: Bethany Hettinger

Hello Raina_b22,



None of the Mac computer described fit what I have (2 Thunderbolts, 1 HDMI).



What do you mean with "currently your mac only supports 2 external display"?

What has changed in my Mac computer, as I was able to connect 3 external displays just fine a few months ago?



I appreciate the help!

Cheers!

Answer #4:

By: Pink Cassin

Marcelo,



We cannot speak to why your Mac was able to connect 3 displays previously or what has changed.



According to the article your device only supports 2 external displays.



We would recommend leaving feedback for Apple here: MacBook Pro feedback



Take care!