Read here how to fix the bug on the game that it doesn’t start.
L.A. Noire is actually a good game, but unfortunately, it makes many people problems to play it on the PC.
Not only that the game has a 30 FPS lock, it doesn’t even start.
I had the same problem and want to show you how to get it to run.
As first you should close steam completely to avoid other bugs.
Open Install Directory
Now open the installation directory where the game is and in the LANoire.exe you put in the properties: always run as admin
Open steam with admin rights
Now open your steam with admin rights and click on “play L.A. Noire”.