Edit: Okay, I seemed to get it working. I started again, this time with the premise that maybe my bios file was corrupt. Sure enough, when I swapped that out, things started working.
Thanks again for the help everyone! I appreciate the comments and postings in this thread and it's really helped me out!
Excellent! Glad to hear you got it working. It's always so incredibly frustrating when it's something like that, and you've been doing everything right all along with no success.