I've resigned myself to the fact that I need yet another RMA.
Pulled all connections other than power using the new
PSU, and OMG it posted! I figure ok, cool, maybe I had a pin off on a
usb header or something. I hook up the "old"
PSU, power on and get infinite 90 to 99 loop again. DOH! I pulled the battery, got some dinner, put the battery back in, same problem. Hooked the new
PSU back up, OMG it posted! So, I'm wondering if it's a bad
BIOS or the old
PSU at this point. I had my DOS
usb stick at the ready and flashed to b09. Flash ended at C1, but it did
post again. I set things up in a default config, save and exit
BIOS, and it again goes into the 90 to 99 loop. AAARRRGGGHHHH!
I'm going to see if Newegg will take pity on me and let me get a different board.