I relocated a power button on a laptop not long ago (albeit on an ancient model) Given the fact that laptops and computers almost all use the same hardware for the actual switch itself you should have no problem relocating it in the same way I did. Just find out which pins are used by the switch (trial and error works fine!) then solder on some extensions with ordinary wire. Get hold of another bog standard switch from somewhere (mine came from an old desktop case) and then wire it up correctly, placing it wherever you like. If you're going to build it inside an actual desktop case then you can actually just solder the cables straight from one switch to another.
First few pics here;
http://www.thebestcasescenario.com/f...6&postcount=42
And some here;
http://www.thebestcasescenario.com/f...2&postcount=63
show how I did mine
(just seen msmrx already said this but now you have detail and images. Hope it helps :p)