A lot depends if it ever worked, or if you had it working and then it stopped working. If you have never had it working, then chances are you have a solder splash somewhere that may be causing you some issues, although the main result of a solder splash is a frag, not what your experiencing. Check for solder splash last.
Do this first. Put your chip into recovery mode and see if it will boot. If you get the same results as you did with the chip in normal mode, then I would suggest using a multi-meter and check all the voltages of your pins in the pin header. Make sure they are in spec or close to spec.
I had a similiar experience and the BIOS was corrupted in the flashable (volatile) section of the Xenium chip. The recovery mode will let you boot from the static (non-volatile) portion of the Xenium chip, which should boot correctly if the pin header is installed correctly. Also, have you verified you do not have a fake/clone Xenium chip?
I would also verify that you have the chip seated correctly on the pin header (and not backwards), and that the pin header is installed into the correct holes of the LPC. Check out some pictures in the tuts to confirm. This may be self evident, but it never hurts to double check.
If you have done all this, and are pretty experienced at this type of stuff, then tell us what version of xbox you have, if it worked once, but not now, and maybe post a picture so we can see if you have a real or fake Xenium (in the event you can't find how to check) both with the chip on the header, and the chip off.
Good Luck.
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Topic: Drive Will Not Open, Xbox Does Not Boot Right (Read 30 times)