Many people other then me have been having this problem.
What happens is upon launching the game it'll load up the program then go to a black screen(no signal found). It wont do anything further ,i am force to alt-tab open task manager and force end task.
Attempt(s) to fix -
Running both Steam and Arma 3 as administrator.
Using the verify integrity of game cache (through steam).
Reinstalling the game.