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External monitor not detected

The second screen stays black · The display is not listed in settings · The monitor flickers before losing signal

Peripherals & hardwareDifficulty 2/315 minLow risk

Applies to: Windows, Mac, Other

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Initial troubleshooting steps

Unplug and reconnect the device, trying a different cable or port.
Restart the computer with the device connected.
Update or reinstall the device driver.
If the problem continues, contact IT with the device make and model.