I'd started an earlier thread on this topic but can't seem to find it. I have a Radeon Mobility 9200 ati card. I have two problems when I try to use an external monitor 1) it does not always detect the monitor unless I reboot. I try system- preferences -screen resolution, detect monitor. That works sometimes. 2) once detected, a dvd will not show on an external monitor unless I use grandr and click the internal monitor 'off.' Then it works. But when I reverse, I do get the display back on the internal monitor but no mouse function until I reboot. Any suggestions? Gary