Why is audio not playing from the speakers?
Regardless of which audio application is being used, sound will not play through the speakers (even if the volume is turned up to its maximum level).
There's probably a small hardware switch in the headphone port (like in many Apple devices) that's stuck. When there isn't anything plugged into the port the switch should be protruding ever so slightly. If you have a flashlight handy you can peek inside it and see if you see it. If not, try plugging in a pair of headphones a couple of times to see if it unjams it. If that doesn't work, it could be a software problem or a deeper hardware problem.
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First, try a soft reset. All you have to do is power off the device, then wait one minute and turn it back on.
More solutions can be found on the device's troubleshooting guide.
Dan D さんによる