The following Knowledge Base article provides some great, in-depth steps for troubleshooting keyboard performance on your Macbook.

Or, disable the Speak selected text when the key is pressed option.

With Slow Keys on, you need to press a key for a longer period of time for it to be recognized.

With Mouse Keys enabled, you cannot use the Numeric Keypad to enter numbers--instead the keypad moves the pointer (cursor).

There is an option to enable Mouse Keys with five presses of the Option key; you may want to turn that option off to avoid accidentally enabling it.) If Mouse Keys is enabled and you are using a keyboard with no numeric keypad or Num Lock function, see Unable to type while Mouse Keys is enabled in Mac OS X.

Open TextEdit (or any text application), and try to type something using the keys that were previously not responding to see if they highlight in Keyboard Viewer.

If the keys work while started from the Install disc, then the keyboard itself is working correctly.

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Typing App For Mac Air