A:Answer Not sure what you mean by power source, but it does include a power cable that plugs in to the back of the PC via the pre-installed power supply, which then plugs in to a standard wall plug. I believe it's called a NEMA 5-15P to IEC C13 cable.
This system is basically a "pull out of the box, hook up all your cables, then turn it on for setup" pre-built.
Now, with that said, it does NOT include cables to hook up monitors, wired network, printers, etc., but does include a mouse and keyboard.