How long did you have it for? Did you buy it new? on average 3% coming out of manufacturer is malfunctioning. You could have gotten one from that 3%. I recommend you return the keyboard where you got it and before you leave the store with the new one, try it in front of the salesman.
Disconnect and reconnect your computer keyboard, then restart your computer.
Sometimes a poor connection can result in keys not working on your keyboard
Update the device driver for your keyboard by going to the manufacturer's website of your keyboard, and then download and install the latest driver matching the brand and model number of your keyboard.
Disconnect your keyboard from your computer and inspect the pins in the keyboard connector if you have a PS/2 connector.
The PS/2 connector for your keyboard has six pins, which connect into a PS/2 port of your personal computer, to allow for communication to and from your keyboard.
Straighten any bent pins you may find, by gently using a ballpoint pen.
You must replace your keyboard if you see broken pins.
Try testing your keys using a different application, such as another word processing program. Keys like the function keys on your keyboard labeled F1 through F12 may not work in one application but will work fine in another.
Clean Under Desktop Keys
Disconnect your standard desktop keyboard, then press down on a key not working.
Slip a car key or a flathead screwdriver underneath the key.
Twist the screwdriver or car key until the keyboard key pops off.
Use a damp cloth, moist cotton swabs or compressed air to remove dust, hair, and food crumbs under the key.
Use only water or rubbing alcohol to moisten the cloth and cotton swabs---other cleaners can damage the plastic of your computer.
Position and press down on the key to snap it into place.
Repeat this for all of the keys to clean underneath them, if necessary.
hope this helps
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