If you have nothing to lose, try that tapping noted at https://www.google.com/search?q=you+tap+the+camcorder+a+few+times+without+the+tape+in%2C+it+will+accept+tapes+again.&ie=utf-8&oe=utf-8 in the Amazon review.
I have a Cannon ZR200 Mini DV Camcorder. It will not accept previously recorded or new tape. after inserting the tape it will and ask to remove the tape. Any Idea o help wij be appreciated.