I instaled a Xenium and when i booted up there was just the M$ dash. Nothing changed.
I got upset cause i had a bitch with the D0.
So i got on line to see if i could find an alternate D0 found one and found the references to the 1.4 and 1.5 (this was a couple months ago when Xenium first released) I had just bought my xbox and thought that it may be a "1.5"
so i read up. Saw the 2 wire bit. NO answer as to where to run the power for the 3.3V though so i searched again. Someone said about using the R7D5 or something(don't recall the name) the small capaciter so i checked it and saw the Pretty LED that i didn't know was there.
JOY JOY JOY...... The chip had power. So I soldered it. Tried to run the ground to a screw hole and it wouldn't take so i said fuck it. Put the alternate D0 on and closed her up.
Wham...Presto

It's aliveeeeee. lol (sorry)
Anyway the chip worked everything was good. Still works i run it everyday no problems.....
Except I have no ground which i guess is alright unless i have a power surge or maybe it'll cause my mobo to over heat (reaches 135.F highest so far)
So why doesn't mine work with no wires and works with the one wire?
I used the LPC pins that came with the Xenium (I removed the #4 pin also)
Feel free to pick this apart, critisize, ask questions, whatever.
Just adding my expierience to help the myth get busted.