Booting a G5 iMac via ethernet?

[big_malk]

I'm sure I've heard somewhere that it's possible to turn Macs on via ethernet, I've looked around on google and the forums here but haven't found a thing saying how to do it. Is it possible merely I imagined this?

I want to boot a G5 iMac, connected via ethernet through an AirPort Extreme, (802.11n 100Gb model).

[tersono]

Boot from cold, no. Wake from sleep yes if you have the 'Wake for Ethernet Administrator access' option turned on in Energy Saver and/or have a copy of ARD.

[kheller2]

It is called netbooting, you hold down N during boot. You have to have a netboot server with an OS image of course. I don't believe it works over wireless (how would it know your ID, password, etc..).