Hmmmmm... My dads Betamax has a tendency to do this (don't laugh... We have hundreds of bought Beta tapes which are not really replaceable). You really have to find the mechanism that ejects the tape, the mechanism that takes the tape to the videoheads is not as important - you can get the tape out of that mechanism by hand, just lift it out. Next you have to get the buggar to eject the tape. Again try this with a powered machine, otherwise find the main motor that operates the loader and use your hands and/or scredrivers and what not to operate the mechanism.