There are many situations that can lead to "no sound". Here are just a few of the causes that we have seen before.
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Sound was switched to a Bluetooth or other device that is no longer active or plugged in.
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Wrong output device selected - go to Status menu > click on the arrow next to the volume slider > click on internal speaker output or headphone or other device. NOTE: The active audio node depends on previous selection you've made, and the status (active/inactive) when previously unplugged. Thus if you unplug the headphone jack at time you listen to the Internal speaker(being selected manually from the audio menu), next time you plug the headphone jack you'll still hear the internal speaker, till you manually switch to Headphone.
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For Bluetooth devices - try resetting the Bluetooth device to factory default and pairing again.
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Not powering off regularly - simply closing the lid doesn't count. Try it now - do a “Shut Down” by clicking on the Shut Down button on the status menu, or press the power button for a second, and then click on “Power off”. Then power up again and log in.
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Accidentally pressing the mute key, or turning down the volume on the Chromebook
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Selecting mute or turning down the volume on specific websites. Note that YouTube and other websites with embedded content, will have audio controls that are in addition to the ChromeOS system controls. You must enable sound in both places.
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Using an HDMI connection to a TV or monitor and not switching back to Chromebook speakers after unplugging
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If you are using a Play Store Android app, some do not support audio through an HDMI connection. You would be better adding a Chromecast to your TV.
- Audio EQ, or other sound extensions - check that the amp, preamp and EQ sliders are in the mid ranges, and not at 0
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Extension interference that can be fixed by using Guest mode or doing a Chrome Browser Reset
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Cache problems that can be fixed by clearing the cache
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Internal hardware issue that can be fixed with an EC Reset (Hard Reset) - do that now - it won't hurt anything.
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Other profile problems that can be fixed with a Powerwash (Factory Reset)
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ChromeOS problems that can be fixed with a Chromebook Recovery
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Hardware failure in the audio circuitry (contact your Chromebook manufacturer)
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Internal cable disconnected after dropping the Chromebook
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Damaged earphone jack
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Incompatible audio codec in media being played (see the file types and codec types here)
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Incompatible web content (Silverlight, Java, old plugins)
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Adobe Flash problems
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Headphones defective or not fully plugged in
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Headphones incompatible with the Chromebook
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User entered Developer Mode at some point
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User installed Linux in Developer Mode.
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ChromeOS bug - note that this is rare and unlikely compared to everything listed above, but is a possibility once everything else has been eliminated.
To troubleshoot this further, we need some basic information from you about your case:
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Is the Chromebook running an up to date version of ChromeOS? (use chrome://version/ and tell us the first three lines)
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Is it a managed device or profile (that's why we ask for the output from chrome://policy)?
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Does the problem happen on all websites, on specific websites, or randomly?
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Do you hear sound with headphones plugged in?
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Does the problem happen after you do a complete power down and restart (don't simply shut the lid)?
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Did you try to adjust the volume with the volume keys and slider (did the system respond when you pressed the volume keys, did the slider just snap back to where it was)?
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Can you fix the problem, but it returns after a short time (that may indicate a profile sync problem)?