Promethean Projector Changing Computer Display Settings
We have the Promethean short throw projectors in school. We have nearly 50 of these. Every single one of them is changing the resolution on the computer itself. If I turn on the PC, then turn on the projector plug in the VGA it displays at the correct resolution (1140 x 900), but at some point in the day they change them selves to 1024 x 768. On a widescreen board and widescreen PC's this makes the image look really bad. Once it is at 1024 x 768 I can only change it to a 4:3 resolution. The only way to get them back is to do the above. I can't pin down at what point they are changing the resolution.
We have tried loads of different display settings in the projectors none have worked. We have tried different graphic drives on the machines as well. We never had this on our old projectors (Mix of Hitachi, Casio LED & Sanyo's).
Our computers are all Dell OptiPlex 7010 USSF running Windows 7 x64.
Does anyone have any suggestions please?