I got a new SAPPHIRE RADEON 5670 HD card and i replaced it with old NvIdia 8400gs.I also uninstalled old drivers from old gpu.However the card didnt came with instalation CD and when i downloaded drivers for this card from ATI site it still did not work.It didnt install anything at all and when i run dxdiag all informations about card is N/A.Windows can not find any drivers for this card it doesnt even reconize what kind of card it is.Can my onboard card cause this problem ?Or am i completely lost? Will reinstalling a fresh windows solve this? And i checked also connection graphics card is connected fine and fans are working so where is the problem? Thanks for reply