ok, they just showed up on your desk one day?
Surely you know where/how/why they were put in your keep to load OSs on?
There is no root boot system. The OS is what you need. Those two links above are your lifesavers if this is important to you. Likewise, being vague about my questions won't help either. It might just help to determine if there is an IT policy on the device, or whatever.
I am trying to help.
How do you know they have no OS on them?