Disconnect the thunderbolt display from ac power by unplugging the cord. To do so follow the steps below.

Apple S Thunderbolt Display Explored And Explained
Thunderbolt display not working. Power cycle for 30 seconds disconnect the thunderbolt displays magsafe cable from your mac. If you can get your hands on another cable use that to connect your. Its a tried and tested method for hardware that sometimes needs to reset itself. Apple thunderbolt display cables bending damage it is not unusual for the thunderbolt cable to get damaged over time due to bending. Disconnect all usb peripherals and any cables plugged into the thunderbolt display. Uninstall the intel thunderbolt software present on your system via the control panel programs and features.
I tried updating the thunderbolt firmware and all other drivers are up t. Check that the thunderbolt cable is working. Thunderbolt 3 should be able to support dispalyport 12 however when connecting my monitor it does not throughput any signal at all. External display detection not retained. You may find that some monitors cannot be detected or initialized after unplugging and re connecting the dell thunderbolt dock tb16 cable to your precision 7710 or 7510 mobile workstation system. Try connecting using standalone thunderbolt cable can be purchased from apple.
1 disconnect the thunderbolt display cable from the host computer. Turn it off and on again. 2 connect a known good thunderbolt peripheral cable male male to the thunderbolt port on the back bottom edge of the. Make sure your macos is updated to the. My notebook does not have a single displayport however it does have a thunderbolt 3 port. Disconnect the plugable thunderbolt 3 dock from the system and remove its power cable so it turns off completely.
Restart the system even if. Before we start 1. Wait at least 30 seconds before powering on your. Port not working intel thunderbolt controller not visible in the osdevice manager usb c or thunderbolt docking stations not visible or having connectivity problems hdmi output not available system battery not charging with a usb c power. According to lenovo symptoms of the usb c problem include.