Mac not detecting external monitor or display
Try a different USB-C cable or adapter, make sure monitor is powered on and set to correct input, check System Settings recognizes the monitor, and restart both devices to re-establish the connection.
External monitor problems stem from faulty adapters, incorrect monitor input selection, loose connections, or resolution detection failures. Most cases resolve by trying a different cable or adapter, ensuring the monitor is on, checking the input source, or restarting both devices.
Fix-IT-Bot will walk you through each step — just tap, no typing needed.
Skip — I just want a technicianCommon mistakes to avoid
- Using cheap USB-C adapters that don't support video output
- Assuming monitor is broken when it's just on the wrong input
- Not powering on monitor before connecting to Mac
- Giving up after first cable attempt when a different adapter can work
Signs you need professional help
- Monitor works on other computers but not your Mac
- All different cables and adapters fail to work
- Mac shows monitor in Displays but resolution won't change
- USB-C port looks physically damaged or corroded
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