Why won't the top row of letters type on mac book pro?

The top row of letters won't type on my mac book pro and the "b" letter acts as a back space.

http://support.apple.com/kb/TS1381
Try Pram reset
http://support.apple.com/kb/ht1379
and SMC Reset
http://support.apple.com/kb/ht3964
read
https://discussions.apple.com/thread/3786218?tstart=0
may be a hardware problem

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