If Cortana doesn't respond to the wake word, try these steps to resolve the most common causes:
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Check to make sure you have a working microphone. Check that your microphone is enabled and set as the default device.
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Check your privacy settings. Your privacy settings can prevent Cortana from responding to your voice.
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Check that "Cortana" mode is turned on. Note: The wake word is currently disabled in recent versions of Cortana but will be re-enabled soon.
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If you're going through the set up experience, there may not be an issue with your computer or microphone.
 
For step-by-step solutions to each of these potential causes, see the "Cortana can't hear me" support topic.