After installing updates-Removing user-opens to Welcome screen

As the title says, I am setting up a computer for a relative and since the time I worked for Apple, I have forgotton the terminal commands to remove the test user I set up and reverting back to the welcome screen so the new user can set up the machine from scratch. I looked around here and could't locate anything pertaining to this specific issue using 10.7.X.   I am not sure if the process changed since 10.4 or 10.5 but hope someone on here can assist me.
Thanks Much!

"Anyone ever heard of anything like this???"
Yes, mine did the same thing but not after a software update. I called and Apple is sending a technician to my house today to replace the hard drive. I could not boot from the system CD, a retail CD, in safe mode,in target disk mode or even from my backup drive. Thank goodness I have Applecare cause it isn't costing me anything but some time.
If you cannot get it to start up in any manner that generally means a hard drive problem. When the drive goes bad, the computer will not do anything. At least that is my experience. The same thing happed to me about 5 years ago with a brand new G-5 iMac. In that case I could not boot up from any media or in any way. Apple sent me a new drive and I put it in myself. It was under warranty also.
This is why it is so important to have a backup. With hard drives it is not a matter of if they will fail but rather when they will fail.
Good Luck!!

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