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You may need to replace the keyboard.. Or we may need to simply reset the pram.. So lets start here
Shut down your Mac.Locate the following keys on the keyboard: Option, Command (⌘), P, and R. You will need to hold these keys down simultaneously in step 4.Turn on your Mac.Immediately press and hold the Option-Command-P-R keys. You must press this key combination before the gray screen appears.Continue holding the keys down until your Mac restarts, and you hear the startup sound for the second time.Release the keys.
Once you boot again, try the keys again.. Will they work now? If not, then we need to run through the full steps below
If you get stuck or run into any issues, let me know.
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