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Helpful answers
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Oct 29, 2015 9:10 AM in response to bimercerby Tom Gewecke,Try another keyboard. If it works ok, then the original is most likely damaged and needs repair.
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Oct 29, 2015 10:27 AM in response to bimercerby 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.