That's good news... Here are a couple things you might try:
1) Make sure camcorder is in VTR (playback) mode.
2) Using imovie8, try all combos of camera on, then launch imovie; camera off, launch, on; etc, sometimes my FCP has issues and I have to do this.
3) Check for imovie8 and/or apple updates (apple sw update, or there may be within imovie, update)
4) Consider trying iMovie6 HD - See if you qualify/meet requirements for [_imovie HD 6_|http://www.apple.com/support/downloads/imovieHD6.html]. More powerful than imovie8, but less user-friendly/easy. You can have both installed no problems.
5) Contact JVC tech support, or maybe the software that came with the JVC can be used on a mac or have a mac version to download ???
I hope one of these works for you. I feel your pain. Been there. Good Luck! : )