I had a system with MS 7529 G31 motherboard with Sapphire AMD/ATI Radeon HD 6670 1GB DDR5 Graphics Card. It was working fine. But few days later it is found that there is no video input message in the screen. I have replaced the same with an Zebronics make G31 mother board. When i put the graphic card there is no video except starting windows screen. Then re installed windows 7. Found the same problem. Peculiarly the system is not show any screen with graphic card output but on the board VGA output it functions properly with MB bideo output but while shutting down only video part is becoming off but the system runs as usual.