X and Fluxbox :: Problems with TFT

Hi there,
as I am fairly new to that kind of stuff, I dont know if my question is silly...

Anyway: DSL runs fine... but when I enter X my TFT-Dispaly says: Frequency to High and there is no Output.
I cn go back to the textmode with no problem.

How can I set the refresh rate to 60Hz (this is perfect for the TFT Display)

The Video Card will then run in 1024x768x16@60hz...

Cheers
Chris

original here.