Update (July 2018): Got audio issues? Try our full no-sound troubleshooting guide for Windows:
I have no sound on my HP laptop – speakers and headphones do not work. When I watch a video or play music and click on the speaker icon, I can see sound being detected … I just can’t hear anything. All tests indicate speakers are working (which they’re not).
One recommendation was to reset BIOS …
In Update and Recovery, is it safe to click on “refresh your PC without affecting your files”?