Ok. So you've got multiple computers at home and they are scattered all over the house. Ok, Remote Desktop is cool. Jumping from one computer to another is cool. Oppsss. One of the computers upstairs is off and the other computer at the other end of the house is off? You're in the middle of something really important and can't afford to lose focus on that code you're working with. Sorry, you're alone at this time. There is no one that you could ask to turn those computer on. 

Wake On LAN is the answer. Thanks to Zainnab from http://blogs.msdn.com/zainnab  for sharing this.

Download Wake On LAN