Satellite A300-129 - Sound is muted and icon does not respond

Dear all,
I am trying to switch on the sound of my Satellite A300-129 after I had muted it a couple of days ago, but the icon does not respond.
When I click on the right mouse button, I can go to sounds etc., but "Open volume mixer" does not respond either. I have also tried to restart the laptop a couple of times, but that did not help.
What can I do? Your help will be much appreciated.
Heleen

>How do I do that safely without risking losing sound forever?
LOL You will not lose anything for ever. :D in worst case you will have to reinstall the OS using the Toshiba recovery disk.
Access the device manager -> mark the sound card -> use delete button -> reboot the notebook
After new reboot the sound driver should reinstall again and should detect the sound card.

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