The best way to reset your HDMI port on your TV is to unplug the power cable from the wall outlet, wait for a few minutes, and then plug it back in. After that, turn on your TV and try connecting a device via an HDMI cable again.  If you are still experiencing any issues with your HDMI port after trying this method, you may want to consider getting professional help or consulting the user manual of your specific model of TV for further instructions, as a malfunctioning port cannot be ruled out in this case.