When I used full screen in as3, application opens full screen, but it completely blank. At other computers all works fine. I searched hard and found that sometimes hardware acceleration could provoke this. I turned off hardware acceleration manually (by right-click menu on flash app > settings), and app started work in full screen correctly.
How could I detect, if client have hardware acceleration turned on, and application shows him white screen? If any possibilities to fight with this problem other way?
For video hardware acceleration you should use the VideoStage class. So if you can get an instance of the StageVideo class then hardware acceleration is available. How to get this instance described here.