while trying to change the default shell to bash, i some how changed the root user name to Root. :cry: i found a post from Stubear about switching to single user mode, and was able to switch it back.
i think his post would make a good how-to. one thing, i did different was to do a reset, instead of taking the battery out. it was still a pain to get into. took a couple of times to get it to work. this was on the 6000L model, so they did not change it.