I checked with ASUS and there was one more MB BIOS update 1 month after the one that I had last installed. I updated the BIOS. Same problem. [I had forgotten what a pain it was to work with floppy drives and DOS. In hindsight, I should have used a CD instead of a floppy as the floppy would not hold the flash utility, the old BIOS, and the new BIOS.]
I then found an old flat IDE cable and installed it. Everything seems to work fine now. I just need to pick up a new round IDE cable and install it.
Many thanks for all the ideas and help on this one everyone!