MacBook does not detect an external monitor: test the video path first
Request My MacBook charges through USB-C, but the external monitor stays black, says No Signal, or does not appear in macOS display settings. The same monitor may work with another computer. Start with the video path, not the dock shopping list. A USB-C cable or hub can charge a MacBook without carrying display signal. The monitor can also be on the wrong input, the cable may not support video, or the MacBook model may have an external-display limit. ...