If your PC and HDMI device use different cable types, you can buy and make use of adapters. Make sure the fit is tight and snug for an optimal experience. If your HMDI port not working as before, then another method is to reconnect and restart your device. Should it show up in device manager as a separate entry under display output? In many a case, the culprit was a broken or worn HDMI cable. Then you have to check through the Device Manager, whether that particular device is being displayed or not. Also, use a soft-bristled brush to clean those ports. HDMI port, and am having difficulty figuring out the two device drivers that are missing from device manager. Once there be sure to choose your specific display device, and then click on submit to download the latest drivers.. Restarting/Reconnecting Your Devices . Step 2: Select Device Manager. Bought a HP USB-C to HDMI Display Adapter (P7Z55AA#ABL) to go with my Envy. Unplug your TV and then plug it back to the HDMI port. Unplug the cables and then plug it back in again. If the input source is HDMI 1, you’ll have to connect the cable to the HDMI 1 port. Now shut down the computer, TV, monitors laptop, etc, and then unplug all the related power cables. Check the manufacturer’s website on the specific product’s specifications (occasionally they would indicate the HDMI port version) 2. Last question: Does Sometimes, it proves an effective method to make the working of the HDMI port. For example, if audio is not coming, then using the Sound item of Control Panel, you can check it. This makes the cable, port and device effectively one unit, significantly reducing stress on the port and cable connector. To determine the port functionality experimentally, you would need to have all corresponding devices physically, Type-C USB device, Type-C DP device/adapter, etc., plug them in one by one, and see the system reaction in Device Manager. Now, see if the issue is fixed. Often something as little as restarting your laptop or reconnecting the devices can actually fix the issue that you were facing with your HDMI port. Windows 10 does not recognize the device. or is it just part of the display output and not listed separately. Device manager shows it as Unknown USB Device (Port Reset Failed). I don't have another HDMI device to check the output other than the second monitor. If an HDMI port device driver exists, I'm having a difficult time locating it. Sometimes, your HDMI port may be working but no audio or video signal. If there’s no issue with cable or the HDMI port, we recommend try the two solutions mentioned below in the order they appear. You should also inspect that the HDMI ports (PC and monitor/TV) aren't covered with debris or dirt. First, inspect your HDMI connections. Just follow these steps: First of all, disconnect your HDMI ports. I'm beginning to wonder if the HDMI port requires its own device driver, just as the older COM and LPT ports require them. Some HDMI cables on the market incorporate a small thumbscrew that screws into the hole normally occupied by the screw holding the port in place on the device. Help! Monitor is good, cables are good, I'm thinking the HDMI output is bad but don't know how to check. There are two ways to go about this: 1. Use another HDMI cable and check if that fixes the problem.