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Jul 10, 2016 12:54 PM in response to deadoriginalby Drew Reece,Try the keyboard on another Mac or PC. If it still fails you know the keyboard is broken. You can also try the keyboard when booted into recovery mode as a basic test. That will tell you if the keyboard works OK when a simple copy of the OS is running without all your installed apps.
OS X: About OS X Recovery - Apple Support
Select the option to browse the web to try the keyboard in Safari in recovery mode.
If the device is from 2010 you should look at buying a new device, otherwise if it is new & still in warranty return it to the shop or manufacturer.