Fixing HDMI Sound AMD / nVidia High Definition Driver on windows not showing TV / Monitor / LED / LCD device. Its basically due to your windows is not verifying the Driver Signature. Simply restart your computer and press F8 button before booting up the computer and chose disable the Driver Signature Enforcement option and press Enter and its done!. If this video helped you press like or you can subscribe my channel for more fixes or donate on PayPal: [email protected] Thanks