Click the sound icon on the systray area of the taskbar. Using the device list that appears, select your laptop speakers.

Nice try. If it was that easy. I wouldn't come here for the solution.

Its official speakers are not working. Test sounds are not working through speakers. I have updated and reinstalled the drivers. Any solution, please?

Fixed mine. Go to control panel > hardware and sound > manage audio devices > realtek speakers > advanced > unclick/turn off "enable audio enhancements. Stupid that is the issue but seems to work for youtube at least

Same issue, just noticed today. Have run the diagnostics and it was unable to fix it. Seems like ever since I synced bluetooth headphones. Even with bluetooth turned off and output set as computer speakers there is no sound. The 'test' sound works fine in both the left and right. Restarted multiple times, made sure everything is up to date and nothing.

I did what you said, still not working

This one worked for me, thanks. Dell XPS 9xxxx

Reinstalling Realtek driver fixes the problem, unfortunately, the problem comes back again... I still have this problem on Latitude.

Sound problem is big issue with dell laptop, when my laptop auto updated, my sound not working, either wired head phone stop working and Bluetooth headphone starts working or vice versa , after i update drivers then again laptop sound behaves opposite like Bluetooth stop working and wired headphone working.  Dell please find solution for this.