The keys on my keyboard do not work all the time. I have to strike a key more than once before it appears on the screen.

I've changed batteries on my wireless keyboard with no help. It is a Wireless Keyboard 1000. I'm thinking it could be caused by an addon, but not sure which one.

Fast answers:
1. Try resetting NVRAM/PRAM and SMC. Doesn't usually 'cure' keyboard problems you report, but it costs nothing and only takes a few minutes.
https://discussions.apple.com/thread/3819550?start=0&tstart=0
2. Try plugging in a USB keyboard. Doesn't absolutely have to be a Mac keyboard. A PC keyboard will work for a test. If the typing problem does not occur with the USB keyboard, you have a temporary solution until you can arrange to visit a repair facility.
3. If your MacBook is older and has a user-removable battery, shut down the computer, remove the battery, and examine it for signs of 'bulging' or swelling. Then connect the computer to the Magsafe power supply, without reinstalling the battery, and turn it back on. If the keyboard problem has gone away, it was likely caused by a swelling battery.

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