Lap top to tv

I messed with sound and now it won't play sound on tv when hooked to lap top . I did it bc I couldn't hear sound on lap top when I unplugged hdmg whatever from my tv - point is I turned it off where it won't play sound on tv when plugged in but still visual play so ... Anyone have an idea how I can fix it so I can hear sound on tv when lap top is plugged in ? It was a long tv blue rectangle sound thing I accidentally discounted but again sound on lap top works just not tv when thre plugged in ...
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    sounds like you were screwing with the tv settings and turned off your internal speakers.
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