Installed GIAC chip => car won't start. Help!

I tried installing a GIAC chip tonight and my car doesn't start. I tried everything under the sun but nothing works... My GIAC chip came with one of those security board things... seems that not everyone is getting these, but I did. Anyways...
I did these steps to install the chip:
1) Disconnected negative battery cable
2) Took out ECU and removed the stock chip
3) Plugged in GIAC chip with the security board it comes with
4) Put the ECU back, reconnected battery
5) Turned key to ACC and waited 3 mins
6) Tried to start the car...
The car simply won't turn over and actually start.. it sits there and cranks, and cranks, but doesn't start.
My first thought was that I didn't plug the chip in properly.. so I went back in, and made sure it was. I also made sure the connector to teh ECU was also firmly seated. Still didn't start.
I thought I might have fried the ECU, so I just plugged the stock chip back in to test it. The car started perfectly.
Last thing I tried was removing the GIAC chip from the security board and putting it into the ECU directly. Still no luck!
What the heck is going on?
I was thinking it could be a chip coded from the wrong ECU # (mine is 259 AA), but from what I've read on the 'tex, that would result in my car running really rough and even stall -- however, my car should still start.
Currently my car starts fine with the stock chip, but I'd like to get this GIAC chip installed Anyone have any ideas?


[Modified by bobby_t1, 9:42 PM 2-7-2002]