I recently reinstalled windows on my rig. I installed all the essential drivers for my motherboard, and GeForce Experience. The gpu I have is The GTX 550ti. There is no video output from it through the DVI port, and I know it isn't broken because it was fine earlier today. The DVI port on my MB does have an output and is working. I tried disabling the integrated graphics for my CPU (i5 3570k) in the device manager, but that did not help. I have no idea why it won't work but any help is appreciated.