New Stereo Install on 2000 Xterra - ???

I have just purchased a new steroe to finally replace my factory stereo. The removal part was a breeze and the install was going great (so I thought). I don't think I have the wire codes right or something because it will not power on!! Does anyone know the right wire codes????

http://www.installdr.com/InstallDocs/Nissan/Xterra.html

pdf files; hope u got adobe acrobat reader...

if this site doesn't help you, www.nicoclub.com has a whole array of nissan factory service manuals online for free... check them out!