When I connect my headphones there is no sound
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When I connect my headphones there is no sound but they do work in the rest of the computer
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Check the audio output device in the game's options and set it to your headphone/speakers.
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I had this issue. Once you've made sure your ear/head phones are working in other games go back into Blops 2 and go to options, settings, sound, sound device and make sure it's the same as your head phones.