Wireless keyboard stuck on caps lock and green led goes out

my Imac wireless keyboard works intermittantly.I put fresh alkaline batteries in and it is still intermittant.The small green led comes on for a few seconds and the goes out.it also seems to be stcuk in the upper case.
It is about 2 years old and have never had this problem before.Also,there is no other electronics within 3 feet of the computer.
Help would be appreciated.

Please do both a iMac SMC and PRAM reset

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