The fact that you have a speaker icon, no x and left/right clicking on the speaker icon does nothing is odd, you would normally have no speaker icon either, most odd.
Have you reinstalled the drivers for the motherboard since reinstalling Windows 10 Pro and starting with the chipset drivers first.
Download then run Speccy (free) and post the resultant url for us, details here, this will provide us with information about your computer hardware + any software that you have installed that may explain the present issue/s.
To publish a Speccy profile to the Web:
In Speccy, click File, and then click Publish Snapshot.
In the Publish Snapshot dialog box, click Yes to enable Speccy to proceed.
Speccy publishes the profile and displays a second Publish Snapshot. You can open the URL in your default browser, copy it to the clipboard, or close the dialog box.
For the speccy url, see if the attachment below helps.
Regarding the drivers, Windows does sometimes update drivers, problem is that they sometimes install the wrong ones.
If this is a brand name computer it may be easier if you post the brand and model name or number and let us look for the correct drivers for you.
Regarding step 4 in the Speccy attachment info, to paste the url into your reply you right click in the dialogue input box, click on paste and then Add Reply when you are ready.
There is more than one model in that range of PC and without knowing the exact one we cannot find the correct drivers for you, all is not lost though, see driver info here please note what it is advised regarding Windows 10 drivers.
Great news and thank you for letting us know that all is now well with the computer
Couple of suggestions for you, create a new system restore point and create a back up of your drivers, all the info that you need is available at the two links below;