Greetings. When I boot up the computer it shows nothing but a black screen. I'm on my 3rd Gigabyte Radeon HD 7970 3GB, I returned the first 2 thinking they were dead on arrival, now I'm starting to think I'm missing something. I'm upgrading from a Sapphire AMD Radeon HD 6870. I have tried: removing the old graphics card drivers. taking out the battery from the motherboard to reset it. Using HDMI and DVI on a different monitor. Is it just a bad luck streak with 3 dead video cards in a row? or am I missing something? My Motherboard is a MSI P67A-G43 and power supply is 750w and Windows 7 64bit.