Hi I recently bought a projector and plugged it into my laptop. Everything was working fine until I used the projection settings on my laptop to have only the projection screen on instead of laptop and projector. The laptop screen goes off but the projector just says invalid format. I thought maybe just unplug the projector and then change the settings. But this doesn't work because as soon as I plug the projector back in it just remembers the old settings. Anybody got any ideas?