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External Monitor Not Working with MacBook in Clamshell ModeUpdated 8 months ago

If your external monitor isn't working when your MacBook is closed (Clamshell mode), it's likely due to power requirements. 

Here's how to resolve this issue:

  1. Power requirement:

    Your MacBook must be powered to function in closed-lid mode.

  2. Steps to follow:

    • Insert your MacBook to the docking station.
    • Connect your docking station to a power source.
    • Ensure the power cable is securely connected to both the docking station and the power outlet.
    • Connect your external monitor to the dock.

  3. Troubleshooting:

    • If the monitor doesn't turn on immediately, try pressing a key on an external keyboard or moving an external mouse to wake the system.
    • Ensure your monitor is set to the correct input source.

  4. Compatibility check:

    • Verify that your monitor is compatible with your MacBook model.
    • Check if you need any additional adapters for proper connection.


If you've followed these steps and still experience issues, please contact our technical support team for further assistance at [email protected].

You may also refer to our instructions page for more information: www.ascrn.com/DS-instructions

Note: Always use Apple-certified or high-quality third-party charging accessories to ensure optimal performance and safety.

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