I am currently experiencing the same grief with Canon’s Vixia HV40.
When I follow the manual’s sparse instructions, set up the menu as per pages 42 and 80 (making sure I have selected the DV option and not the “import from analog source” option, and connected the cables, noting happens. iMovie acts as if I have not connected the fiwire cable, no mater what I try. There is a whole online forum dedicated to Canon’s Vixia not importing to the computer. Suggestions have ranged from plugging the cable in first, hitting play, then turning on iMovie, to going to Canon’s website, looking up Canon HV40, then downloading any “drivers” you might need. I use a Mac with Lion OS, so it says “driver updates not needed”; however, no matter what I do, my computer ignores the connected Canon camera. I wrote an email of complaint to Canon, and I hope you do too.
Wish I could have helped more, but at least you’re not alone. If you’re using a PC instead of a Mac, downloading drivers for this camera from Canon’s website might actually help. Good luck.
Digiguy
DigiGuy