Try downloading driver.  [URL]  [IMAGE]  
My system has a 500w thermaltake psu and a GTX 760. Everything ran fine until I reinstalled windows. I uninstalled the gpu and installed windows using the onboard graphics. After the install was complete I reinstalled the gpu and didn't get any signal from the card. The fans and drives were spinning and it seemed like it booted into windows. I tested the cables for the monitor and they worked on my laptop, could the hdmi port be the problem? I dont want to waste money trying to fix the issue so I came here for help.
Optiplex 990 No Video From Graphics Card