Nocking noise is usually bad IBT assembly (CRU). Reinsert color toner usually means replacing the drum(imaging kit) for that color (CRU). But as you are getting nocking noise I would try belt first
We have received 10 New Xerox VersaLink C400 printers here at the Police Department. The very first one I set up is having problems with the black toner. The error states "reinsert Black Toner and restart Device (092-321). I check the toner there is still some toner in the cartridge, but when I remove and reinsert, it still gives me this error and will not print.
Plus it makes a knocking noise when starting.
Milwaukee Police Department