Hmm -- you could try removing the battery for a few minutes, to reseteverything to the default state.Other than that -- perhaps try installing a hard drive and a CF card and see which boots....
Sorry if I wasn't clear. I can boot the thing (build IDE disk on another, sorta similar platform and boot), but I don't know what the jumpers mean and it all leaves me having to pull the thing out of the rack and opening it up if the simplest thing goes wrong.