In order for a computer to be turned on remotely (via wake-on-lan not Rube Goldberg style) you will first have to make sure your hardware can Wake-on-lan. You will then have to do some basic networking to get it all done.
Can I throw a third party website link down? If not use Google and search for wake on lan, click on the second link that says wake on lan mini HOWTO
http://gsd.di.uminho.pt/jpo/software/wakeonlan/mini-howto/
If you found this discussion useful, why not register/sign-in? It only takes a minute to share your feedback, ask a question, or vote for a new feature!