JVC GR-D290U suddenly displays safeguard or safe mode, "eject and reinsert tape" are the instructions. I do that repeatedly and now, the tapes won't play. The camera powers up, but the message won't go away and the tapes won't play. Prior this the camera worked great. Can anyone help?

What is your model# so we can help?

Nothing will be guaranteed by anyone with a device of two years old plus you don't even mention what model of camcorder you are referring to, a major impediment into giving any answer!!