Tv 20WLT56B lost audio when connected to PC

I have a toshiba 20WLT56B tv which produces no audio when i connect my PC to it via an audio cable to the tv PC audio in. It use to work then i tried tuning my tv using the controls as i lost my remote and now there is no audio. Audio is okay when a tv station is tuned, and the PC produces audio through external speakers. Is there a factory reset or what else could you advise please

That doesn't appear to be a US model, and this is the Toshiba USA forum, so I don't have any information on it. You might want to check Toshiba in your region.
- Peter

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