Other Help Topics :: Graphics Issues
Not an entirely accurate description, but any pictures do seem to have inverted colours...
I've tried running in various different modes (this is my work computer, a crappy intel based gfx & mobo, celeron cpu booting from cd) from 640 upto 1024 (max this monitor can take) and irregardless of the colour depth or resolution, the result is the same: Pictures showing their colours to be inverted.
I don't think dsl likes me... 
Try editing your /home/dsl/.xserverrc file and add the command line "-swaprgb" to the Xvesa command.
Then type CTL-ALT-BACKSPACE or choose Window Manager Exit
Then type "startx" to restart.
You will only get 8 bit color and the background will change color on you but the active window will look normal.
original here.