Ah okay. I was wondering what exacty the deal was with the board and its IRQ assignments. It wasn't until after my attempt and failure that I cracked open the manual hoping for an answer (or maybe an IRQ assignment list) and found the page with fine print regarding the board, including the "Don't put a PCI card in here, here, or here".
I'm going to give 'er another shot this evening after work. I'll try slot 4 as you asked and hope for the best.
Thanks for all your help along the way...