Here's a new Sonus sound pack for everyone to enjoy:
Metal Gear Solid 2 Codec (w/shutdown sound)
Power on uses the "CodecOpen" sound.
Power off uses the "CodecOver" sound.
Eject uses the "CodecCall" sound.
These official sounds bits were released by Hideo Kojima himself and modified by me to work with Sonus.
This is what I personally use on my console(s). Before my Trinity console died (GOW3 edition), it was lovingly called my "Metal Gears of War" console.