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"RE: Bought a new "used" D300"
If you haven't already gotten this sorted out, I would do a two button reset back to factory default, then go from there.Here is a link to the Nikon support page for doing this:http://support.nikonusa.com/app/answers/detail/a_id/17395/~/how-to-reset-a-d-slr-to-factory-default-settings