Do the cards work in other devices?
Did you try a reset or format in the camera? ( I didn't see you provide a link to the camera manual so I can't reference the pages that's on. )
Camcorder worked fine at first. Didn't use it for a few months, and the next time we tried to use it, we get this message when we press the record button:
"No memory card"
It's this way no matter what memory card we try to use. It's as if it's not recognizing it at all.