I have a similar problem with a 56 plate TDCI Zetex Galaxy. The dash computer display was working fine, then suddenly the screen flashed and is now blank except for a couple of rows of red dots right at the bottom of the screen. It stayed like this even after turning the ignition off, locking the car and leaving it for 20 minutes or so. Having left the car overnight, it seems fine this morning, but does anyone know what might be causing this?