And doesn't Apple's hardware test have a keyboard section? (it's been years since I used that.)
I have a MacBook Pro 15" (Ultimo 2011), and yesterday i began having trubles, with my keyboard.
I'm running on the Yosemite Public Beta 10.0, but have already restored to OS X Lion. Which didn't help.
The problem is, that when I Press the " n " key, it writes " n' ", or if I press the " X " key, it writes " X< ". The " z " is now increasing the volume, and so on...
I have already reset the SMC and PRAM, but it hasn't helped..