I have a brand new. I have a brand new acer aspire L5100 desk top. I am in the middle of setting

Question

I have a brand new acer aspire L5100 desk top. I am in the middle of setting my system up. It came without an instruction manuel. I have installed monitor to the pc. The keyboard and the mouse are wireless. The pc seems to have power to it but I can't figuire out how to turn the pc on. It does not seem to have an powe button. If you could help me that would be wonderful. Greatful in California Nora Westermeyer [e-mail]