Hi there, Just recently built a new trading computer for my self and got two dual-DVI NVIDIA video cards for it. I connected two to the first card (connected to PCI-E bus 1), and the other to the second card which is connected to PCI-E bus 4. Computer detects the 2nd card and drivers, but the 3rd monitor (solely connected to the 2nd card) flickers on and off appearing to switch between Analog and Digital, which what it says on the screen. This happened when I at first connected the 2nd monitor to the 1st card but hitting AUTO Source on the buttom of the monitors did the trick, but not on the 3rd. Monitors are all Samsung 906BW 19" WS and the video cards are both XFX Nvidia 8600 GTs. If you have any insight into how I can fix this, please let me know. I tried going through the Windows troubleshooting, but that was no help (obviously!). Thanks!