You can be made to come in before your official shift would normally start--employers determine when you have to work and are not bound by the shifts they themselvses assign you--but MUST pay you for all time you are working. Working includes setting up your computer, logging in, etc. Any time you spend doing something necessary for your job and required by the employer is "work" and must be paid. So they can either start paying you at 12:00, when you come in, even if you can't begin actual doing your job proper until 12:10; or they can start paying you at 11:50 if you come in early to take care of the set-up.If they not pay you for all time spent working, you could contact your state department of labor to file a wage and hour complaint.