OK, I checked the hardware and there are two drives in the machine - one for boot and one with photos and other data. They are connected to a PCI controller card that had two channels. So, I tried switching the cable on the controller card to the second channel.
After booting with knoppix, fdisk -l showed the two drives. I went for the gold and tried booting the system normally. It ran into some read errors from the boot drive when running a forced disk check, so it dropped down into maintenance mode and I ran fsck /dev/sda1. I let it correct the errors it found and then the machine booted up and is running. During the boot up fsck was forced to run again on the second drive, but no errors were found.
One fatality from the fsck on the boot drive - backuppc dies because there were some bad nodes found in one of the perl modules.
I think I need a new controller card and to reload some software. How would I tell aptitude to download and re-install what is currently on the system? My thinking is that will correct any issues caused by the bad nodes found on the boot drive. If I can get this drive back in good shape, it may be time for a new drive as well.
Any other thoughts or ideas?
Mark