Keyboard on MBP won't work. Help!

[mojolounge]

After installing Mountain Lion, most of the keys on my Macbook Pro won't work. I didn't have any issues before installing Mountain Lion. Luckily, I have an external keyboard I can connect and use. Any suggestions on how to get it to work properly again?
Thanks!

 

[Sital]

It might also be helpful to know which MBP you have. Did anything go wrong during the installation? In any event, I would try re-installing Mountain Lion.

Oh, and you might want to ask this in the MBP or ML forum (I'm sure it will be moved there soon enough).