As per the post title, the USB-C port on my Beelink GTi 8 Mini NUC PC Core i5-8259U fails to output video to my monitor. It was working fine but now isn't. The port still recognises peripherals so it isn't dead. I've tried connecting different devices and with different cables but no luck. I've tested the cable and the monitor using another USB-C device and video is outputted with no problem. So there's definitely an issue with either the port or a setting that I haven't yet managed to find.
Please turn off the PC , unplug the power supply, and press the CMOS button (poke the hole of CMOS with a pin) for about 10 seconds , restart the PC after ten minutes.