Mac shuts down if I do not keep either the Fn, Command or control button held down ?

Hi. I have a mac book pro late 2011 model. I am running Mavericks but but I have a problem where my mac shuts down if I do not keep either the Fn, Command or control button held down. Also if/when this shut down happens I need to hold the shift-control-option keys to restart the mac.
Anybody got any advice for me ?
Many thanks
Paul

Try resetting the SMC.
Barry

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