Wireless keyboard stop working

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.,,,
i turn on the bluetooth from the imac and nothing is coming there..
anyone have any idea about this??
thankx...
i have been usilllllçlçlng

thankx..but i already check all those post and apple info pages...
i really dont understand...the keyboard was in the box inside the imac box ,with the imac inside..nothing broken for sure..just the keyboard stop working..
and i was wondering if there was someone with this problem..
the keyboard its a aluminium model without on\off button,

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Wireless keyboard stop working

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