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Apr 27, 2016 9:28 AM in response to federico290by Eric Root,Wired or wireless keyboard?
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.