Bipin Yadav :
My samsung Laptop Model No. NP300E5Z keyboard's several keys not working. Yesterday it was good but suddenly one by one approx. 7-8 of my keys stopped working..Wat to do to fix it. Also USB keyboard is working well.
I could be a few things. Possibly hardware problems, but maybe not because both your USB external and internal keyboards don't work. It could be a problem with your OS. I assume you are using Windows? If so, try to boot into safe mode. If you are running Windows 7 or lower hold f8 key while booting. If you are on Windows 8 follow this:
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Once you have booted into safe mode, see if the keyboard works. If not, try going to device manager and uninstalling, and reinstalling the device driver for your keyboard...