just find out the value for that cap and replace it. there are people here that work on xboxes and can easily find out that value for you. you can probably get a replacement from digi-key's or newark's website.
here's to hoping you didn't screw anything up with that "replacement" cap.
if it makes you feel any better, i did the same thing but with a resistor. i unknowingly removed it from the mobo by accidentally bumping my soldering iron up against it. this cause my xbox to only boot through the chip.
the ms bios would not boot with that resistor gone. once i figured out the problem, i
asked around (yesterday) for the value of that resistor. i got an answer and i used a resistor i had laying around that had the same value. it was a far cry from the same type of resistor, but it had the same value and it worked just fine.
here's a pic of the resistor i accidentally removed and consequently broke (it's the one in the red circle):

here's a pic of my make-shift replacement resistor:
i'm happy to say that my box is now working 100%!!! w00t!!!
This post has been edited by ikill2game: Aug 12 2004, 04:56 PM