Hi Guys, I'm a newbie so apologies if this is the wrong place to ask this. A school i support has installed new Promethean Activ Boards in all the classrooms. They have noticed that the image displayed on them is very grainy and very hard to make out. When they try to play DVDs on the board they display very jerky images and the DVD pauses at intervals almost as if it's buffering. They use Hitachi projectors which i think are quite old. The computers are Dell AIO, connecting to the board with a Startech USB to VGA converter. I've checked the cables, connectors, projector leads, removing the converter and plugging the board into my laptop direct, changing the settings on the projector with no joy. I tried ringing Promethean who blamed the projector, Hitachi who blamed Promethean and Startech who were helpful but unable to help. Can anyone suggest anything i can try please?