I have a sheevaplug with debian 6 on it, this is a fresh install unpacked from a backup I made so I could experiment with different applications on the plug, so there is nothing but the base system on it. When I plug in the displaylink monitor, it goes green and dmesg shows that it is detected. The model, resolution, and /dev alias are all correct. However, typing 'sudo startx' causes the screen to blank momentarily, then return to green. it does not load LXDE (which I have installed after decompressing the clean image). I know this has to be something simple, but I can't find it.
Any help is appreciated.