I have sound when I am connected to the TV, but when I disconnect the HDMI cable I no longer have sound. None of the sound devices in the control panel seem to be turned off. Can you suggest a solution to this problem?
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Your post is rather vague but reading between the lines I suggest you right click the speaker icon in the systray (lower right) and select 'playback devices' then find the playback device you wish to activate and 'set default'.