Ensure your HDMI cable is properly connected to your monitor and motherboard. If your monitor has multiple HDMI and other display connectors, make sure that the source is set to the right connection/source. Try using a different cable – perhaps the one you’re currently using is faulty.
Why is my HDMI port not working?
The HDMI cable you’re using might be malfunctioning or too old to perform adequately. Try a different HDMI cable to see if it solves your issue. Alternatively, you can use the first HDMI cable to connect a different video device to check if the video device is malfunctioning.
How do I know if my HDMI port is working on my motherboard?
Check Your Cable To check whether it is actually the case, you can simply use another functioning cable. Connect the working HDMI cable to the device, for instance, the monitor, and then to the HDMI port in your motherboard. If you are able to see the display in your system, then your HDMI is working fine.