I just built a new system with Intel Core i5-2500k processor with ASUS AMD Radeon HD 6800 Video Cards. I'm running Winddoes 7 Ultimate, 64 bit. I've loaded fresh copies of FSX with both service packs and the Acceleration Expansion Pack. Everytime I start a flight, my monitors lock up. Some times they work for a few moments but they usually lock up right away. I have checked both the ASUS and AMD sites and have the most recent video drivers loaded.

My previous Core 2 duo machine also ran Windows 7 64 bit but with NVIDIA video cards. Are there any known issues with Radeon video cards I'm not aware of? Any insight would be appreciated...