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. If your HMDI port not working as before, then another method is to reconnect and restart your device. Unplug the cables and then plug it back in again. For example, if audio is not coming, then using the Sound item of Control Panel, you can check it. Use another HDMI cable and check if that fixes the problem. If your PC and HDMI device use different cable types, you can buy and make use of adapters. Step 2: Select Device Manager. Should it show up in device manager as a separate entry under display output? or is it just part of the display output and not listed separately. If the input source is HDMI 1, you’ll have to connect the cable to the HDMI 1 port. You should also inspect that the HDMI ports (PC and monitor/TV) aren't covered with debris or dirt. Unplug your TV and then plug it back to the HDMI port. 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. In many a case, the culprit was a broken or worn HDMI cable. I'm beginning to wonder if the HDMI port requires its own device driver, just as the older COM and LPT ports require them. Also, use a soft-bristled brush to clean those ports. Windows 10 does not recognize the device. HDMI port, and am having difficulty figuring out the two device drivers that are missing from device manager. Just follow these steps: First of all, disconnect your HDMI ports. Sometimes, it proves an effective method to make the working of the HDMI port. Check the manufacturer’s website on the specific product’s specifications (occasionally they would indicate the HDMI port version) 2. Once there be sure to choose your specific display device, and then click on submit to download the latest drivers.. Restarting/Reconnecting Your Devices . Then you have to check through the Device Manager, whether that particular device is being displayed or not. This makes the cable, port and device effectively one unit, significantly reducing stress on the port and cable connector. Sometimes, your HDMI port may be working but no audio or video signal. Last question: Does Now, see if the issue is fixed. Now shut down the computer, TV, monitors laptop, etc, and then unplug all the related power cables. Bought a HP USB-C to HDMI Display Adapter (P7Z55AA#ABL) to go with my Envy. 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. I don't have another HDMI device to check the output other than the second monitor. There are two ways to go about this: 1. 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