Why is there no display after connecting a USB Dock to an external monitor via HDMI, DisplayPort (DP), or VGA

Q: Why is there no display after connecting a USB Dock to an external monitor via HDMI, DisplayPort (DP), or VGA?

A: If the USB Dock is connected to an external monitor but no video output appears, please check the following items in order:

1. Confirm the USB Dock is connected correctly

• Unplug the USB Dock from the laptop, then reconnect it and confirm the device establishes a normal connection.

2. Check Windows Device Manager

• Open Device Manager and confirm that the USB Dock–related devices are recognized correctly.
• Check Display adapters, Universal Serial Bus controllers, Universal Serial Bus devices, or USB Display Adapter for a yellow exclamation mark (!) or Unknown Device.
• If you find any abnormalities, reinstall or update the corresponding drivers, then reconnect the USB Dock.

3. Update the graphics card and USB Dock drivers

• Confirm that the system has installed the latest graphics card driver and the USB Dock driver (for example, the DisplayLink driver).

4. Check the monitor’s input source

• Confirm the monitor is set to the correct input signal (HDMI, DisplayPort, or VGA).

5. Verify Windows display settings

• Open Settings → System → Display.
• Select Detect and confirm whether Windows detects the external monitor.
• Under Multiple displays, choose the appropriate display mode (Extend, Duplicate, or Second screen only).

6. Confirm the laptop’s video output settings

• Press Windows + P to select the appropriate display mode.
• Some laptops may disable external video output. Check in system settings or BIOS to confirm that external display output is enabled.