First things to always check:1. Your sound is not muted.2. On laptops make sure one of your function keys has not muted the sound.If you are using Windows anytime you add or... moreFirst things to always check:1. Your sound is not muted.2. On laptops make sure one of your function keys has not muted the sound.If you are using Windows anytime you add or remove a new sound device Windows in it's infinite wisdom will always switch to that device as the default sound device.Examples:You plugin or add a new wireless headset.You add a new monitor or TV on HDMI and it has sound.You add a new video card that has HDMI and it can do sound.How to fix your sound if it's not working afterwards.Open Control Panel it sound be on your menu under your username. If not just search for it.Go to "Sound" left click sound then a box should open showing you monitors with sound, video cards with sound, headset...Look for your default sound device "RealTek" is the most common. But could be IDT, Sound Blaster, Intel Sound...Then left click your default sound device (it should turn blue) then on the bottom left click "Set Default"Like this picture as you can see 6 of the video cards can do sound "RealTek"... less