Wow! I've done it. In trying to add a new drive to my system I edited my fstab file incorrectly. I set the new drive to mount to /. That means that both the new unformatted drive (jumpered to be slave) and the old PC-BSD system drive (jumpered to be master) are set to mount as root.
As a result the boot loader fails and attempts to reboot endlessly. I believe all I need to do is to be able to edit the fstab, or to somehow bypass it, but I can't get past the boot loader. I was able to get to the boot loader command prompt and the 'more' command confirmed that the fstab file does indeed contain the error.
I've unsuccessfully tried to mount the drive using KNOPPIX. It claims to not recognize the file system. I'm in the process of installing PC-BSD on the new drive and seeing if it can master the old drive and successfully mount it. We'll see.
I'm thinking without mounting the drive successfully I won't be able to access and edit fstab. My mount procedure was:
mount -t (tried several file types here) /dev/hda1 /mnt/hda1
The system calls the drive '/dev/hda1' and an empty '/mnt/hda1' directory does exist. Would appreciate a confirmation of the correct fiel type to use. Any help would be greatly appreciated!