http://www.aviosys.com/ippower.html
I use a 4 port IP Power device to control my observatory (model 9258).
The trick to booting up your pc is to set the bios to reboot the machine after power failure - this means that after you shut down the PC as normal you can then power it down in between sessions using the remote switch. As soon as you put the power back on, up it will come!