I have just installed build 18298 for windows 10 insider. It is showing that I have no sound device installed. What should I do?
Preview versions of Windows 10 do not have official support and issues are expected. In your case, you may need to reinstall the audio drivers, or rollback to the previous version, and wait until the next build releases to see if that fixes the issue.
I rolled back to the previous build and that fixed my sound issue.
Good. I hear some other users complaining about the same issue. I may be this build.