If you launch the game and screen stays black.
Our Portal 2 troubleshooting and fixes guide can help you resolve most of the problems you may come across while playing or in your attempt to play Portal 2. Every big game launch on PC doesn’t come hassle-free, so you may have had to go through several problems at start due to reasons you would find in the article below. Portal 2 has been released on Steam after a whole week of release anticipated.
