Trevor wrote:
My sound was a bit tinny so I went into the Realtek HD Audio to change
the settings. I don't know what I changed, only the room type I think
and now I can't get any sound at all, although the volume control is
showing sound.

Check that the main pair of speakers are plugged into the correct jack,
and you've enabled setings on speaker configuration to match. I came
across someone who had mistakenly plugged his 2-channel set into the
"rear-channels" port of his multichannel capable PC ... and wasn't
getting much out ...

Also, this group is mainly for hi-fi audio equipment - not PC although
the term "audio" is close. We haven't yet seen requests for help with
doorbells and hearing aids - but that day will undoubtedly come ;-)

--
Adrian C