I have a toshiba tablet which was working just fine & suddenly - no sound - right while I was using it. I was switching back & forth between recording some things & listening to some online videos - so I'm concerned that one of the different sound-related programs did something/changed a setting. Now I'm in a world of silence. I have a SoundMax sound card. When I check it out using the audio options in the control panel, it says it's enabled & functioning properly... NOT! If anyone has some great ideas they are willing to write out - please do!