the monitor is just a standard crt, i normally run it on 1152 by 864 at 75 hz i did try lowering the frequency and reolution but no joy, ill have another look at the settings, and see what happens.
ok now this will sound stupid but what exactly do the cheat codes do ?
ok i think you are right, if the cheat codes are a set of info as to what knoppix is doing then, its trying to display at 1280 by 1024, which is ok, until it trys to do it at 80 hz and thats where the monitor goes ping.
cheers for the help.