i must take a photo for you but i have had an arduino board with a servo from an RC car in a little robot arm design connected to one pc ,and mounted on the other pc case which will hold in the power button using a simple button on a website using wampserver so i can always hard reset when im not around.

of course its only useful if the other pc stays on. but i think it could be managed directly from router  using an ethernet/wifi arduino board


( you could probably set up all 3 from the one board but you would need 3 servos)