Firewire 800 cables aren't working...

Hi,
I just bought a couple of Firewire (1394B) cables for my external hard drives. I've been using Firewire 400 to 800 cables without any problems, but when I connect the 800 cable, my drives will not mount on my desktop.
Any suggestions?
I've looked on line but can't seem to find any info.
Thanks!

Are you sure those cables are 9-pin (fw800) to 6-pin (fw400) cables? I bought a couple of 9pin/6pin cables from monoprice to hook up a couple of external fw400 drives and the cables worked fine.
Here's the link to the cable I am using:
http://www.monoprice.com/products/product.asp?cid=103&cp_id=10301&cs_id=1030105&pid=3542&seq=1&format=2
Message was edited by: X423424X

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