HT2452 my imac keyboard has stopped working? help!!!

my imac keyboard has stopped working??? help!!!!!

My keyboard just stopped working out of the clear. One minuet OK next it was dead. No little green light at all. New batteries did not help.
FIXED THE PROBLEM!  I took a small piece of aluminum, made a little ball out of it and dropped it down the tube where the batteries go. Replaced the batteries I had just used......little green light comes on and the the keyboard functions like always.
My guess is after a few years the contacts oxidize a bit and don't make contact with the batteries on the bottom of the tube. Give it a try.

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