On Mon, 2016-03-21 at 23:07 +0000, Mark Fletcher wrote: > It couldn't be a dodgy cable, could it? > > Mark I don't think so. If that were the case it would flash on and off as the cable moved. It is resolutely blank, except just sometimes. The cable is behind the desk, so it doesn't ge tmoved. It may have something to do with the momitor itself, but I don't have another one to substitute. Oliver