The controller’s batteries are low, or it’s entered Sleep Mode. … Try pressing and holding the Xbox button on the controller to turn it back on. If that doesn’t work, the problem might be due to a drained battery. Try changing the controller’s batteries or connecting its charging cable.
particularly, Why won’t my controller connect to my Xbox?
If you aren’t able to connect to the console at all, replace the controller batteries with fresh ones and make sure the controller is powering on. … You can use a USB to micro-USB cable to connect your controller to your Xbox.
thus, Why won’t my Xbox controller turn on with new batteries?
Batteries: The most common reason an Xbox One controller fails to turn on has to do with the batteries. If the batteries are worn out or in need of a charge, it won’t turn on. … Battery contacts: The controller won’t turn on if the battery contacts are worn out or bent too much.
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