well, i got an xbit, installed it like normal in my 1.1 and it didnt work.
I determined that the d0 wasnt making contact. I decided that the best way to fix this would be to stick a little length of very small wire in the hole which would just barely extend above the surface of the board, to make contact with the pogo pin. I put in the length of wire, then reassembled the xbox. Now, my xbox doesn't work, even with the xbit completely removed. I press power, and the power led on the eject button comes on for a second and the fan spins then it stops. It repeats this cycle 3 times then the light flashes red and green until I turn it off.
I am so depressed and mad at myself right now.
I hope the xbox isnt broken.
.....
...
grrr

I'll tell you what I did to my xbox.
I took out my enigmah chip, it has like 28 little wires. I wanted to go on xbox live. Anyways in the process of clipping off the wires, one of the wires I accidently yanked on and when I pulled it out , it took out the little solder that was in the hole. After this happened, my xbox gave me the exact same problem you described. I took it to my friend to help me out.
Because the solder came out the wire that was attached to it was now loose on the motherboard. My friend just attached a new fine piece of wire from the other point on the wire of the motherboard to the point where I pulled out the solder , basically bypassing the wire on the motherboard with his new wire, understand? I know this sounds a little complicated, but it's actually simple when you look at it.
Anyways after he did that , the xbox works fine. I wouldn't worry about it too much , you can always take it to a mod expert or probably any electronic store.

if i had to guess, i'd guess you damaged the via at D0. with nothing else to lose, you may want to try heating the bottom D0 point, while you have a small piece of wire tinned and coated with flux inside the top of the via - that way, you may be able to reconnect the via, and you'll have a small bit of wire sticking up which you can then solder onto the end of.
another choice, might be to solder your chip using the bottom connector - it may work with the via damaged.
it's also possible, if you only loosened the solder off the botom, that you could heat it and reconnect it to the D0 point.

I fixed my xbox!!!!
YAhoo!
I relaized that I broke the trace where the d0 via (is that what the little rings are called) meets the trace for it and fixed it with some conductive paint!
Back to life!
Yahoo!
thanks xbox-scene!