A few months back I posted about how whenever I accessed certain websites, both of my monitors went black, and there was nothing to do other than restarting my computer.
Today I was able to solve the problem. It turns out that it was not just restricted to my browsers. It also happened whenever a desktop program accessed graphical elements using the Java Runtime (I was clued into this when trying to install the Zend Studio – which I presume is written using Java – and got the black screen of death. I confirmed this when I tried to uninstall the Java runtime, and got the same result).
After some Googling, I found this post on the NVIDIA forums (I also have a NVIDIA card in my DellLatitude D820) in which someone complained about the same problem, and ended up solving it after turning off FSAA (Full Screen Anti Aliasing) and Ansiotropic optimization in his video card control panel. (I found more support for this on other posts and forums). It took me a few minutes to locate this in my NVIDIA control panel (It is in 3D Settings > Adjust all image settings, which you can only see when you are in advanced view), but after turning off all Anti Aliasing and Ansiotropic functions, programs and websites which previously caused a black screen are now working fine.