Ever since I updated it to Windows 10, my volume isn't working at all. I don't hear anything at all. What could be causing this?? Before I updated, it was working fine.
Go to the Start Menu, and type in sound. Sound (Control Panel) should be one of the search results. Open it and make sure the right playback device is selected. If it isn't, right click on the correct device and select "Set as Default Device." If that doesn't help, open Troubleshooting in Control Panel, and open Troubleshoot audio playback. If that doesn't help either, you will need a different audio driver.
That happens to me as well, even if I install W10 from scratch. I don't know why this happens, but it sure is annoying.