Mac Pro won't see FW400 devices!

I recently purchased my Mac Pro, brand new. I knew it wouldn't come with any FW400 connections, but all indications pointed to there being no trouble whatsoever if I just got my hands on a FW800 to FW400 adapter.
The main device I want for use with this adapter is my audio I/O box, the M-Audio FW410. It's old, but it has always worked with my previous mac (1.67Ghz G4 Powerbook) and never gave me any problems.
I had this cable from before:
http://www.radtech.us/Products/ProCableFW400800.aspx
It worked well, in the past, but not when I tried it with the audio box. Since it is so short, I opted to get another adapter when I saw it wasn't working so that I could use my longer, nicer FW400 cable. I bought this adapter to that end:
http://www.amazon.com/gp/product/B002JH3TW8
The same problem persists.
I've tried my other FW400 peripherals, and the computer can't see them with either cable setup in any of the ports. What the ****?
Is there something about this FW bus that doesn't work with these peripherals? Someone please tell me there's a chance I'm just "doing it wrong..."

Glad to hear further verification that this should be working. Seeing as apple sells the Moshi cable at their store,
http://store.apple.com/us/product/TW748LL/A?mco=MTY3ODQ5OTY
then you would think that there wouldn't be any problems.
Let me add some further info. The FW410 audio I/O box will start up, but then the power light flashes, like it doesn't get enough power. I've tried my old external DVD drive with the cable setup, and it will spin up, but never officially mount. It already has a disk in it, so the volume should show up right away.
System Profiler doesn't see any peripherals attached. The best I've been able to get out of that app was the message, "Warning: System Profiler is unable to detect firewire devices." Now all it does is list, "Maximum Speed: Up to 800 Mb/sec," without that error message.
I don't want to drag this honker into the genius bar to have them troubleshoot it, and then have to ship it out. I can't afford any down days b/c I work most evenings and weekends on this machine.
Before I take it in and perhaps waste valuable days being without it, does anyone know how to troubleshoot this?

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