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Then do a pram reset.
To do a PRAM reset, you need to restart your machine and hold down these 4 keys.
‘Option’, ‘Command (Cloverleaf or Apple)’, ‘R’ and 'P'.
Keep them down until you hear 4 startup chimes. This is the sound that happens at startup, like a boooonnnngggg.
This resets all of the system buses on your computer, USB, FireWire, display, ethernet and your keyboard/mouse/trackpad.
This will correct many faults but not necessarily yours.
If you are using a wireless keyboard please tell me because he instructions for a pram reset using a wireless keyboard are little different.
Let me know please.