HD Install :: HD Install Login

I have a hard drive install on a Thinkpad 600X. For the first couple weeks when it booted it gave the login prompt, I'd type the default user ID of dsl and the password, and I was in. So far, so good.

Now, for some reason it's skipping the login prompt and booting up straight into the dsl user account. I guess I must have done something to cause this, but I have no idea what I could have done.

How do I configure it to start giving the login prompt again?

original here.