Qosmio G20-156 - no sound

Hi,
i'm having a bit of trouble with my g20-156.
It had stopped locating wireless networks, so as it was in need of a bit of a clean up anyway, i restored it back to factory default settings.
The good news is that the wireless problem is now resolved - the bad news is that i no have no sound!
I have checked all of the settings in the sound and audio menus and cannot see anything obvious.
There is a 'mute' light next to the volume wheel that is permanently on.
Any help would be greatly appreciated, as it's driving me crazy!
thanks

There is no manual mute button.
If the mute is unchecked in control panel -> sound then the sound should not be muted.
You said you have set the Qosmio back to factory settings using recovery disk and this didnt help?
Hmm strange for me this would mean that this might be a hardware issue.
The sound driver is from Sigma its very unusual sound driver
Check this HowTO about how to find right drivers maybe you will need some 3rd party drivers
http://forums.computers.toshiba-europe.com/forums/ann.jspa?annID=78

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