How to Fix Thunderbolt Display Not Working on Mac? - MiniTool

Thunderbolt monitor not working? Easy to solve!

The Thunderbolt interface is a display connection technology launched by Apple a few years ago, known for its single-port support for high-resolution displays and high-performance data devices, with a single port that can connect up to six devices. Its speed, simplicity and flexibility are significant advantages, far exceeding FireWire, USB 2 and USB 3, with up to 10 Gigabytes per second per data stream.

However, some users may experience the trouble of the Thunderbolt display not working, and the screen displays blank. don’t worry! The following methods may help you solve the problem:

Method 1: Update Mac and Thunderbolt firmware

If the camera of the Thunderbolt monitor is just not working, you can try updating the firmware of the Mac and Thunderbolt monitors.

Step 1: Open the App Store and click on the profile icon.

Step 2: If updates are available, select Update Thunderbolt and Mac software. If there is insufficient space, uninstall some less commonly used applications to make room.

Step 3: Click the Apple icon, select About this machine , and check whether the Mac and Thunderbolt have been successfully updated in the system report .

Method 2: Reset VRAM (nonvolatile RAM)

VRAM stores information including screen resolution. If the screen resolution is wrong, resetting the VRAM may solve the problem.

Step 1: Click the Apple icon and select Shutdown .

Step 2: Press the power button to restart the computer. After hearing the startup prompt, press and hold the Command , Option , P and R keys on the keyboard.

Step 3: After hearing the second start prompt, release the button.

Method 3: Reset the System Management Controller (SMC)

The System Management Controller manages the system performance, fans, indicators and power supply of Macs. If the Thunderbolt monitor doesn't work, resetting the SMC may help.

Step 1: Turn off the power. Press and hold Shift , Control , Option and Power keys for 10 seconds.

Step 2: Release the button and press the power button to turn on. Disconnect the power cord and reconnect after 15 seconds.

Method 4: Check the display resolution

Setting the resolution to the default value may solve the problem.

Step 1: Go to Dock > Finder > Move the cursor to the top menu > Click Go .

Step 2: Click the application to open the application folder, find and click System Preferences .

Step 3: Find the monitor icon and click to set the resolution to the default value of the monitor .

Method 5: Isolate Thunderbolt Display

Finally, try isolating the Thunderbolt display from other peripherals.

Step 1: Turn off the power.

Step 2: Unplug the Thunderbolt monitor from your Mac and reconnect it after a while. If the problem persists, try connecting the Thunderbolt monitor to a separate power outlet to isolate it from other peripherals.

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