My first idea is to re-check the master/slave jumpers on the two drives.
If they are the same, it could mightily confuse the CPU and cause the symptoms you report.
After that, go into the BIOS and set startup disk to the floppy drive [if y'all have a Utility floppy, to do some diagnostics] or to the CD drive, [to boot to an install CD and use the 'repair failed install' option].