more complicated than I thought
I think I found the correct grub.conf and edited it directly using Emacs as root with a Recue boot of Disc 1. If you notice the FC3 had been switched with FC4 and vice versa. Furthermore, when I did the rescue boot, it showed that FC4 was on, or at least started on, the SDA2 partition, which previously the boot partition; and, FC3 was on the SDA3 partition, where it had always been. There was a warning on the grub.conf that there was 'no boot partition per say and that all would be handled by the individial OS'. Apparently this is a problem, because the OSs still won't boot.
The grub.conf is:
title Fedora Core (2.6.11-1.35_FC3)
kernel /vmlinuz-2.6.11-1.35_FC3 ro root=LABEL=/ rhgb quiet
title Fedora Core (2.6.11-1.1369_FC4)
kernel /vmlinuz-2.6.11-1.1369_FC4 ro root=LABEL=/ rhgb quiet
Previously when I tried to install FC4 it indicated too many partitions and wouldn't let me install, but this last time it let me install, apparently overwriting my boot partition for some reason. Is there something I can do to regain a boot partition? For example, I have a large swap partition. Or can I, in fact boot from the OS partition with some modifications?