Only display on Thunderbolt works. Camera, audio and USB ports do not
There is a known similar issue with certain 27' Thunderbolt displays going black, and having connection issues. https://support.apple.com/en-us/HT204450 

Can you check the firmware version of the Thunderbolt display? 

Apple Menu > About this Mac > System Report > Thunderbolt (from left sidebar) > Thunderbolt Display. 

The latest firmware version should be 26.2 and the latest Port Micro Firmware Version should be 2.0.7.