motherboard graphics issues

Hello guys, I have an old mobo MSI K9n6sgm-v . Athlon 64 dual core 4200+ processor. 4gb ram. I had installed and running on win 64bit a graphic card gts 8600. From day to night video was off. Since I could hear, window was running...so I tough 2 things...card slot may be dirty or card died. I...