A couple of months back, I installed Knoppix 3.3. There was a problem with the screen display which I eventually managed to track down to the fact that the monitor hadn't been properly recognised during the install. Once I manually entered the horizontal sync frequency/vertical refresh rate in the X config, the issue was sorted.

Now I've just installed Knoppix 3.6 on the same box and I'm stuck with a similar problem. The install again failed to pick up the monitor, but adding the missing information manually didn't do any good this time. The monitor shows an empty black band both above and beneath the window display, and the whole thing is shoved to the right, so that there's empty dark gray space to the left while the rightmost bit is cut off.

Any help?