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12-28-2008 04:28 PM
Try Uninstalling/Reinstalling the Driver for the Audio in the device manager.
Click Start - Right Click Computer, Click Properties.
Click Device Manager on the left.
Scroll Down to Sound, Video and Game Controlers. Click the plus-sign beside that.
Right click on the two drivers you should see there, then click uninstall. (You'll have to do each of them individually.)
Click "OK". (Do not check the check box.)
When they're both gone, restart the NB.
They should automatically re-install on re-start.
Re-start the machine a second time, try the sound again.