power key on mba

Hi everyone,

Today, my MBA (bought at the beginning of 2012) just turned out to display a pop up “Are you sure you want to shut down...?” with Restart, Hibernate, Cancel, Shut down options. I did reset SMC but it is not getting better. I guess the Power key may have problems (such as slightly stuck) as I read from some articles, so I think of changing its behavior but cannot find out how.

Could you show me how I can change the Power key to “do nothing” in Mavericks on which my MBA is working? I hope this can get rid of the problem.

Thanks,