ATI X800 Launches open firmware at startup ?!?

I've just installed my new graphics card, and whenever I boot the machine, I get an unfamiliar beep, a longish pause with a black screen, and then the open firmware screen. From here, I'm prompted to type "mac-boot," and once I do, the machine seems to start up normally.
Is it supposed to do that? I'm pretty sure I've got the most up-to-date driver (the August 2005 update from ATI) and the most recent ATI Displays utility...
Any Ideas?
Thanks in advance...
PowerMac G5 Dual 2 Ghz (June 2004)   Mac OS X (10.4.3)   3gb RAM, ATI x 800 XT Mac Edition

That figures (re:ATI tech support). I was surprised that I couldn't find any other posts about this problem on the web. I hadn't installed the card until after I'd already done the 10.4.4 upgrade, so I was guessing it was a new problem with 10.4.4, but I see you're still running 10.4.3. I don't hold out much hope for repair/replacement since we're seeing the exact same problem, on essentially the exact same computer (June '04 2x2 G5, 3.5 GB ram in mine, 3 in yours). I'll post back here if I learn anything new.
-Ed

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