Prior to and after the restore, did you attempt to download the sound drivers from Toshiba's support site? If not, give that a go and see if that gets it going.
IT was all running smooth and one day there was some disturbance in the sound while using sound recorder as i was recording by using the input jack to stream the audio for sound recorder.
As the recording was over i found that there is nothing recorded but just some garbage ( i made sure that the inbuilt mic is disable) since then i have tried all with drivers and then gave to Total recovery.
Still its same - tried with ubuntu live CD still no sound.