I recently got L4D2 in the Summer Sale and I was very excited to play it, but it simply will not launch ( I don't even get a black screen). I have reinstalled it. verified the game cache, and have run it as an administrator, but just won't run. I know other people are having the same problem, so if you have a solution please let me know. By the way I have Windows 8.
In this guide we’ll show you how to open the developer console in Left 4 Dead 2 and list out ALL of the console commands for this game. How to Open Developer Console in Left 4 Dead 2. Option A – Launch the game. Go into your settings and click on “Keyboard/Mouse” and enable the “Allow Developer Console”The *Real* Step 2. Click on the video.txt file (don't open it), then right click, and open properties. Check the box on Read Only, and apply and close it. This will make it so your settings will not be changed without you changing them. For most people, the setting you just added into the file will get removed and your maps will keep being dark
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