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Make sure you have the right cables or adapters. Make sure all the cables are connected properly. Check the volume. Change the audio output. Restart the computer and the TV. Check your computer's display calibration.

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Sometimes cables can have the right connections but aren't made for the purpose of carrying audio or video signals. Make sure the cable is rated for audio/visual use. Most computers don't send audio output through the DVI port, so a DVI to HDMI adapter won't carry any audio in most cases. If so, you'll need to hook up a separate audio cable. Check that all the cables are plugged in properly to the ports and not loose. If the cable has thumb screws, like most DVI and VGA cables, make sure the screws are screwed in and snug. Check that the volume is up on both the computer and TV and make sure neither is on mute. If you're not getting sound, make sure you have the right audio output selected.  Right-click on {"smallUrl":"https:\/\/www.wikihow.com\/images\/c\/ce\/Windows10volume.png","bigUrl":"\/images\/thumb\/c\/ce\/Windows10volume.png\/33px-Windows10volume.png","smallWidth":460,"smallHeight":418,"bigWidth":"33","bigHeight":"30","licensing":"<div class=\"mw-parser-output\"><p>I edited this screenshot of a Windows icon.\n<\/p><p>License: <a rel=\"nofollow\" class=\"external text\" href=\"http:\/\/en.wikipedia.org\/wiki\/Public_domain\">Public Domain<\/a><br>\n<\/p><\/div>"}. Click Playback devices. Select the correct audio output (HDMI output for HDMI, or Headphones if you're using an audio cable) If you don't see the right output, right-click on any of the listed devices and make sure Show Disabled Devices and Show Disconnected Devices are both selected. This will tell you if the audio is disconnected or disabled. When all else fails, restarting the computer and the TV can help the computer to detect that a new display is connected. Sometimes, an error message will pop up saying "HDMI not supported", which usually pops up when your TV and PC have different display settings for resolution.