If you are using one of the cards we specifically do not recommend, you are probably wasting your time (as well as mine). FireWire cards are very cheap – get one with a Texas Instruments chip set !!
That is a problem. It obviously could be the H8000FW hardware, but first I would suggest that you try both a different FW cable and a different computer. Also, check both the FW sockets on the H8000 – they can be damaged by static.