Digging through a dresser drawer, I found an unopened box of CDs that I had bought a couple months ago. It's amazing how we can live in an RV and still lose things.
I reburned the ISO to a CD, performing a read verify. When I try to boot from the CD, I get exactly the same results I did when booting from DVD. It stops after displaying the "Automounter started for: floppy cdrom"
Of course, this laptop has no floppy.