can't login as anyone - not even as root!

[Dave Banning]

All of a sudden, I can't login, even as root. I tried to set the 
password of root to nil (because I happened to be logged in as root at
the time) and that didn't work either.

Then, thinking that the machine was acting up, I rebooted. Now I am in 
deeper. I can't even access the machine.

Any idea why this would happen, or more important, how I can get out?

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