Infocus Projector - synchronisation

Please make sure you are using a resolution and refresh rate compatible with the projector as the sync circuitry in projectors can sometimes be a bit touchy. Also make sure the signal you are providing does not consist of a totally black on the edges as this can confuse the image processor in the projector.  I would suggest looking up precisely what is the native resolution of the projector and what refresh rate it likes, if in doubt use 60Hz. The refresh rate can be set in windows by clicking the "advanced" button in the display properties pane. the pull down for the refresh rate is under the "adapter" tab, or the "display" tab I haven't used windows in a while so I forgot.  If you are sure you are sending the native rez of the projector and still having issues then there may be an issue with something not described in your question such as distance to the projector or environment like dimmed lights causing signal noise. If this solution doesn't take care of things please post more details like are you using VGA or DVI. Good Luck.