Gmod crashes when starting, please help!

When I start the game and the initial loading screen (the one with the Facepunch logo) is shown to me; the game closes on its own and I get taken back to the desktop once the loading screen says “Initialize all game systems”. If you’re willing to help me, consider that these are the things that I’ve already tried:

  • verifying the game cache,
  • reinstalling,
  • deleting all addons.
    Thanks in advance.

Did you try deleting everything before re-installing your garry’s mod? Did you try running it in borderless and/or in windowed?

By “deleting everything” you mean deleting the Garry’s mod folder?