Dell p1110 and 9800np

I have a little problem with my dell p1110. I dont get any DDC Information anymore it was there before not its gone. How do i set a game at 1024x768with 120hz cause i dont know how to do it. I even tried refreshlock and that doesnt work.

Is there a driver for a dell p1110 that works with xp and a 9800np.

Here is a pic of what im talking about.
http://members.rogers.com/mborowski/ddc.jpg

Ok now its back i have no idea why its not there sometimes then comes back.

Everything is fine for now.