> md0: internal 1587k image area <-------what is md0?

in this case, it should be the internal preloaded ramdisk in the
install kernel

> sd0: no disk label <--------------- yea, can't install

this is to be expected on a blank disk (it gets labelled as part of
the install process)

> root on md0a dumps on md0b
> no file system for md0 (dev 0x1100)
> cannot mount root, error = 79
> root device (default md0a)

this sounds like the ramdisk was corrupted.

> Is there something missing from the boot block? 
> Should I be using a different floppy boot image?

you didn't specify what floppy image you were using..

					- Bill