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If you typed your question to Cortana, she thinks you want the answer displayed rather than spoken. Select the microphone icon in the search box and say something instead.
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Your speakers might not be working. Search for Device Manager and select the arrow next to Sound, video and game controllers. If you don't see a sound card listed, or there's a yellow question mark on the name of the sound card, that may be the problem. Get help with sound problems.
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Your mic might not be set up. Enter set up mic, choose the matching result, and follow the prompts.