Qosmio G30 - No sound

This may have been answered before but I've lost sound on my Q30. There's no volume control. I've re-installed the SigmaTel High Definition Audio Codec which Device Manager then reports as working correctly. All the other audio drivers seem to be installed and working. But in Control Panel, Sounds and Audio Devices, No Audio Device.
Toshiba's Help & Support Center suggests that there is no mixer devices available: and to install those, go to Control Panel ...
_BUT_ if I am to add hardware, what I am meant to install? All the relevant audio devices seem to be there already. Am I missing something?
So what next?

Many thanks. I've updated the BIOS. Unfortunately that hasn't helped as regards the lack of sound. And the SigmaTel HD Audio Codec _is_ the latest version as downloaded from Toshiba's website.
To recap, all the various audio devices/codecs etc are reported as working correctly. But when I look at Control Panel, Sounds and Audio Devices, the Volume Tab tells me that there is no audio device. Looking at the Hardware Tab, and the troubleshooting the SigmaTel codec, the Help and Support troubleshooting dialogue pops up and when I get to Open Volume Control on the 3rd page, that's when another message appears as follows:-
*+Volume Control+*
+There are no active mixer devices available. To install mixer devices, go to Control Panel, Click Printers and other Hardware, then click Add Hardware+
+The program will now close.+
That's where I get a problem. *_What hardware am I supposed to be adding?_* And just to muddy the waters, my Control Panel has Printers and Faxes, not "other Hardware". Clicking the alternative "Add Hardware" yields an array of possibilities but nothing that looks remotely like a 'mixer'. What device is that?
The Volume Control icon incidentally does not appear in the System Tray and double clicking C:\WINDOWS\system32\sndvol32.exe produces the same message above.
I'm really PC literate but this one has me stumped for the moment

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