Hey,
I hope you did bend the metal shield in the 1200 a little. Sometimes is presses down on the side were the connector is solderd to causing a short circuit. Which in your case can resust in a GURU
shield metal > ---------|
motherboard > --------()--------- < turbo card
I hope these ASCII signs make sence to it all.
Oh there is also some revision 1200 Mainbord which doesn't work very well with turbo cards. As i remember it was the REV B
Greetz Henk