The escape key in my wireless keyboard stopped working

Dear list members, suddenly, the ESC key in my wireless keyboard stopped working. As it looks normal and all other keys are working properly, might it be a configuration problem? Could you please help me? I'm working on an iMac 27 late 2012 running OSX 10.10.2. Thank you.

Please reset the SMC, this may take 2-3 attempts and post back with the results.
iMac SMC and PRAM reset

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All was going along swimmingly, setting up my new iMac... I did some updates and then for some strange reason my wireless keyboard stopped working? I know it’s not the keyboard because delete works, my widgets work and some other keys work - and - the whole keyboard was working from start up (at first)...
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My wireless keyboard stopped working on my iMac. It shows that it is connected, but it won't respond. It's not the batteries, and I tested keyboard on my iPad and it works fine on the iPad, so it is not the keyboard itself.
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Hi..If anyone can help me, I appreciate..
i allways use my wireless keyboard and mouse with my imac and i never had a big issue with the kb\mouse... until recent,that i stored my imac ,mouse and keyboard inside their respective boxes.
off course i put bateries out,nothing had fall and when i return after 1month, the keyboard stop working!!
stop working completly even the backside light is off and i put new bateries.,,,
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i have been usilllllçlçlng

thankx..but i already check all those post and apple info pages...
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The escape key in my wireless keyboard stopped working

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