At this point it sounds like a video card driver issue. I suggest doing the following...
1. Download Driver Cleaner Pro or Driver Sweeper (both have free versions) to your desktop screen and install.
2. Download the latest diver(s) for your video card but don't install them.
3. Uninstall your video card drivers and reboot your PC into Safe Mode. Run Driver Cleaner Pro or Driver Sweeper. If it doesn't find any video card drivers that is quite okay.
4. Reboot and install new video card drivers.
* Let us know it these steps resolve your issue.