I have checked everything from driver to... but the problem is still coming back. Usually after i have been flying for 15-20 min. One funny thing is that the sound is still coming out from the speakers. But it seems that it is to much for the computer/screen. I use default settings only!What could be wrong?

>What could be wrong?http://www.hifisim.com/images/as2betateam.jpg

The Windowed Mode uses your desktop resolution while the full screen mode is set within the flight simulator. What is your desktop resolution? Right-click your desktop, select properties, settings tab, and read the resolution (800x600) and color quality (Highest 32bit). Press the advanced button, select the adapter tab, and select the List all modes button (if available). It should open a menu of valid modes (1024by768,True Color (32 bit), 85 Hertz), etc.If the adapter tab menu doesn't have the List all Modes, try the monitor or the card (ATI/NVidia) tab to view the valid modes for your card and monitor.Once you know the valid modes for your card and monitor, start the flight simulator, select Settings, Display, Hardware tab. Ensure the correct graphics card is listed in the Device Name box, then select a valid (full screen) resolution in the selection listing. OK the selection, return to the Create a Flight menu, and retry full screen.If the problem still exists, make sure you have updated drivers for the MOBO's controller chips, i.e., Intel, VIA, SiS, AMD, ALi, NForce. Download Windows updates, especially Directx9.0b, remove and reinstall the graphics card drivers.W. Sieffert

Thank you for the answer! I am very happy for this info and will try it ofcourse!!!