I bought Radeon r7 260x and tried to connect my TV Samsung by HDMI. Windows 7 64bit installed standart basic driver and TV showed picture. Then I had installed the latest driver AMD Catalyst™ 15.20.1046 and from this moment Catalyst Control Center and Standart Adjusting the Screen couldn't see the TV. When I turned on the computer and while computer was loading TV was showing the picture. But when Windows had loaded, TV couldn't show the picture. (no singal).