Body
Issue
External display not detecting signal from a Mac laptop.
Environment
Post-2017 Mac laptop
Description
I have a docking system, and I seem to have done something that makes my second monitor not receive signals from my computer. I probably adjusted a setting last fall and forgot what I did.
Resolution
- Connect the USB-C display adapter/dock to a different USB-C port on the laptop (if available), ideally the rear left port. The rear left USB-C port is typically better suited for conveying display signals and Ethernet connections.
- If no other ports are available or no ports work for connecting to the display, make sure all cables are firmly plugged in and that the monitor is on.
- If you are still having trouble, please contact your department or unit IT support for assistance and possible hardware repair.