No audio output device is installed
Your audio driver may be missing or corrupt. Go to the device manager and look under the audio devices. If it doesn't list your audio device or has exclamation mark (!) next to your audio driver, then you're missing the driver.
If you see your audio device listed, then either your driver files are corrupt or your audio device is damaged.
In either case, go to Toshiba homepage, search for the audio device driver related to your laptop's model. Download it and install to see if that corrects the problem. If it doesn't correct your problem, it's possible your Southbridge chip may be defective, in which case, not much you can do.
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