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Nov 19, 2015 12:19 PM in response to Jauchartby 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.
Trackpad or Magic Trackpad is jumpy or erratic
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.