Re: "so when the power returns your server will power up."
I was talking about a home system of the guy I was responding to. I agree you don't want servers in a datacenter powering up just because they see power - if for no other reason than the inrush might cause even more problems than the outage did. But at home, if you have something you want up all the time like a home email server, it better come up when the power does or it may be down for the duration of your vacation if it loses power on your way to the airport.