Thank you! That worked perfectly. X is up, running at 1024x768. That's way too much for an iMac's tiny screen, so I'm still looking for a way to drop the rez to 800x600.
Jeff > During install? A workaround: > > Switch to the console on VT2 (Command-Control-F2) > pdisk -l /deb/hda - note the Apple Bootstrap Partition > hformat /dev/hdx (x=above noted partition)