Are you absolutely certain that 5 pin jack is firewire and not S-VIDEO?
Check your Canon camera manual. The firewire port is usually hidden behind a plastic sealing plug to keep any dirt or dust out. I've never heard of a round five pin for firewire, only rectangular 4, 6 and 12 pin.
Fav quote - "Experience is whatcha don't get 'till ya don't need it no more."
System - Athlon 1.4GHz, Win98, Hauppauge PVR250 receiver and compressor.
Software -Magix Movie Edit Pro 10, Nero 6 + NeroVision Express, Moho 4.61, PSP 8.1, Bryce, Quicktime 6.52 pro, Goldwave 5, DVD-Lab.
Cameras - Panasonic GS9, Canon ES8400V, Canon EOS D20 and Canon A70