I Replaced The Combo Cable Replaced The Logic Board And Still Apple Thunderbolt Display

Chosen Solution

The display does not work when I plug both the power cable and Thunderbolt cable into my Macbook Pro. However, if I plug a Tbolt cable from the Tbolt display to the MBPro, the display works as expected. I have also: Updated the firmware, did an NVRAM reset, did a SMC reset, checked all board connections multiple times, and the magsafe power plug works as expected. Any Ideas, folks?

Check the thunderbolt port on your MacBook, plug it into something else to see if it works.

try to reinstall the cable. It is possible an internal cable isn’t properly connected. Also you might want to check the cable, maybe you received a bad cable.