Third Monitor Not Working on the Belkin INC026/INC029 Dock

If your third monitor is not being detected when connected to the Belkin Connect Universal 16-Port Triple Display USB-C Dock (INC026/INC029), the issue may be related to your computer’s display capabilities, operating system settings, cable connections, or missing DisplayLink drivers. 

This guide provides troubleshooting steps to help restore multi-display functionality. 

Before You Begin 

Check the following: 

• The dock is connected to power using the included 150W power adapter 

• The dock LED indicator is white 

• All monitor cables are securely connected 

• Monitors are powered ON 

• The correct monitor input source is selected 

Step 1: Install DisplayLink Drivers 

DisplayLink drivers are required for triple-display functionality and multi-monitor support on the INC026/INC029 dock. 

Without the DisplayLink drivers installed: 

• Additional monitors may not be detected 

• Triple-display mode may not function correctly 

• External displays may mirror instead of extend 

Install the latest DisplayLink drivers before troubleshooting additional display issues. 

For setup instructions, click here: 
https://www.belkin.com/support-article/?articleNum=317395  

After installation: 

1. Restart your computer. 

2. Reconnect the dock if needed. 

3. Check whether the third monitor is detected. 

Step 2: Check Display Settings 

Windows 

1. Right-click the desktop. 

2. Select Display settings. 

3. Scroll to Multiple displays. 

4. Click Detect if the third monitor does not appear. 

Make sure the display mode is set to: 

• Extend these displays 

macOS 

1. Open System Settings. 

2. Select Displays. 

3. Check whether the monitor appears. 

4. Adjust display arrangement if needed. 

Note: 
Some macOS devices may require additional DisplayLink permissions. 

Step 3: Check Cable Connections 

Verify: 

• HDMI and DisplayPort cables are securely connected 

• The monitor input source matches the connected cable 

• Certified HDMI 2.0 or DisplayPort cables are being used 

If possible: 

• Test another cable 

• Swap monitor ports 

• Test the monitor directly with the computer 

Step 4: Verify Monitor Configuration 

The dock supports: 

• Single display: Up to 4K at 60Hz 

• Dual displays: Up to 4K at 60Hz each 

• Triple displays: Up to 4K at 60Hz each 

However, actual display support depends on: 

• Computer hardware 

• Graphics capabilities 

• USB-C or Thunderbolt support 

• Operating system limitations 

Some systems may support fewer displays. 

Step 5: Reduce Resolution or Refresh Rate 

High display bandwidth requirements can sometimes affect multi-monitor detection. 

Try lowering: 

• Resolution 

• Refresh rate 

For testing purposes: 

• Set monitors temporarily to 1080p at 60Hz 

Then check whether the third monitor is detected. 

Step 6: Restart the Dock and Computer 

1. Disconnect the dock from the computer. 

2. Power OFF the dock. 

3. Restart the computer. 

4. Reconnect the dock and monitors. 

Allow several moments for displays to initialize. 

Common Causes