Hi guys in my computer I have Winfast K8CK804 motherboard and I am using Nvidia 6600 geforce graphic card. From last few days I am experiencing strange problem in my computer. Now whenever I start the computer at that time 4-bit lines appear on my screen. i am using this graphic card from last 4 to 5 months but never had this kind of issue. Please tell me how to get rid of this issue?