Sound not working?

If your sound has suddenly stopped working, and you’re running Windows 10 (version 1803) and received an automatic Microsoft update on or around 11th October 2018, Microsoft have a post about how to fix it here.

There’s also a rather more technical Reddit thread here which explains how to fix it from the Command prompt or a Powershell prompt (in either case it must be an admin-level prompt). Essentially, list the drivers with

pnputil /enum-drivers

and find the one that looks like this:

Original Name: intcaudiobus.inf
Provider Name: Intel(R) Corporation
Class Name: System devices
Class GUID: {4d36e97d-e325-11ce-bfc1-08002be10318}
Driver Version: 08/22/2018 09.21.00.3755
Signer Name: Microsoft Windows Hardware Compatibility Publisher

Note the “Published Name” – let’s say it’s this:

 Published Name: oemXXXX.inf

Finally, do this command, using the value you found instead of oemXXXX.inf:

pnputil /delete-driver oemXXXX.inf /uninstall

Sound should now work. No need to restart the PC.

This only affects PCs which use Intel High Definition Audio; by 12th October 2018 Microsoft had withdrawn the update, but if it has already been applied, it stays applied and your sound won’t work.