Did you clean up the drivers before changing the card..?? In case no then put your previous card back and boot to the desktop.. Perform a clean sweep of the drivers using driversweeper (http://www.phyxion.net/Driver-Sweeper/210/View-category).. Shut down and replace the cards..
was wondering ...did u find a fix? other than getting a new 2nd card?.i have the same issue but with one of the two GeForce 7900gs.after a bunch of things it seems that its one of the cards.it happened when i had right clicked on the realtek wifi icon to repair.thats when the screen went black.I've tried different drivers (though the 179.48 version seems to be the one to use with XP pro) flased the latest bios 3.18...then read in some forum that there was a conflict with the realtek and the nvidia drivers..huhg! if your still around let me know...thanks