Wireless keyboard acting goofy

My iMac is only 6 weeks old, but this yesterday my wireless keyboard started acting up: the delete key now deletes forward rather than backward, the arrow keys skip to the end of the line, even without CMD-arrow, option-arrow does nothing, etc. Any cure for this?

I figured it out--a little piece of something was stuck in my keyboard, jamming the Fn key down, which shifted the function of the various keys.

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    Message was edited by: Moptop650

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