When I was done, the CPU didn't recognize the keyboard, so I couldn't reset the BIOS. I concluded that the keyboard had come partially undone and needed to be plugged back in. The only problem was that it was underneath a trans-Atlantic cable worth of patch cords plugged into the back of the patchbay above the CPU. And those cords were taut enough that they tended to pop out. *grumble*
Tonight, I unplugged each cable from the back of the patchbay, labeled it, and set it aside. Then I plugged the keyboard back in, verified that it was recognized, reset the mixer BIOS, and booted successfully. Then I plugged all of the patch cords back in. In theory, everything should be working now.
In other news, Gretchen and I started working on the last sketch that we're responsible for writing for the ConClave show, but Gretchen was feeling a bit under the weather, so she crawled off to bed after we watched "Scrubs", which left me free to go work on Cablefest in the basement.
With luck, she'll feel better in the morning after a good night's sleep.