THe Wookie

I don't see any switch on the outside. Do you know anyone that may know more about it?

Weird question, is the an ok operating system?

I am in need of some assistance. I have purchased an Atari 800XL and have not had one in almost 30 years. I am looking to run the Self Test, but following the instructions and it is not running. If I turn the computer on without holding anything down it says THE XL BOSS V1.0. What does this mean? When I reboot and hold down OPTION, I get READY. Do I just need to type BYE? If I do and nothing comes up, what am I doing wrong? Thank you, Eric