I use the "M-Play 202 Plus" to boot my computer.... you just need a 5 1/4" bay available and plug a few cables....

Visit: http://www.vlsys.co.kr/

And if your computer is downstair, as you said, you can transmit the IR codes somewhere else with "Powermid Infrared Extender"

[Link: novitatech.org.au]