Mac book air 4.1 same buttons don´t  work

the "W", the two, tab button,
and the the functions buttons dosn`t work,
have you any idea,
can you help?
I have a new installation, it daosn`t help????

Hello olaf64,
Thanks for using Apple Support Communities.
For more information on this, take a look at:
Intel-based Macs: Resetting the System Management Controller (SMC)
http://support.apple.com/kb/HT3964
Best of luck,
Mario

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