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Helpful answers
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Jul 4, 2016 8:52 AM in response to Dr. Daveby Rysz,Might be use to interference from other devices.
Remove the metal battery cover from the underside and see if that improves connection.
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Jul 4, 2016 2:17 PM in response to Dr. Daveby Eric Root,If your wireless or USB keyboard doesn't work
Keyboard/Mouse – Troubleshooting Wireless
Bluetooth devices become unresponsive
Bluetooth Interference Sources
Bluetooth Interference Sources (2)
If your Wi-Fi is capable of generating a 5 GHz signal, try that.
Restart the computer holding down the command - option/alt - P - R keys before the gray screen appears. Continue to hold until you hear the startup chime for the second time.