Wow! Can't believe there were no responses. Oh well, I didn't spend the time waiting. I used a huge ass magnifier to follow the traces from the soldered side of the pin header to nearest point i could use for a continuity check. Every pin was fine. Found a voltage chart for the pin header, checked that, all good.
Thinking it through, i knew the X-Chip was fine because it responded properly to the X-Control software. I was now 99.9% positive the my soldering was perfect.
What was left? The friggin BIOS! I downloaded the 1.3 BIOS, flashed the chip, and viola! the xbox boots showing the EVO-X and X-Chiop logos.
Apparently my first download must have been corrupted. Hope someone else can learn from my screw-up.
Now I just have to find media my Philips drive can read. Argghh.
First 2 attempts at burning Slayer's Auto-Installer to DVD-R gave me two shiny coasters. Hmmmm.....maybe I should check that download....... <