sending video output to a beamer

Hans Mittendorf's icon

Just got my beamer and wanted to hook it up with my G5 to play videos from Jitter. I connected a DVI cable between the G5 and the beamer and connected the monitor to the second output of the G5.
When I use the example 22 video out I have 'Digital Cinema Desktop under the route voclist but nothing is send.
Does someone know how to send video out to a beamer?