Freezing Glitch/Error

When ever I launch Garry’s Mod It either gets stuck on the bar with the logo and just says “start”. Or it launches and its on the main menu but the screen is just frozen. I can interact with the buttons and makes the noise but it doesn’t change the screen. Can anyone please help me with this problem. I verify integrity of game cache and says 1 file is missing and has been replaced. I did this twice. Next I tried to reinstall Garry’s Mod but it still has the same problem. I uninstalled again and even went into the steamapps and deleted the Garry’s Mod Folder and STILL it didn’t work. I unsubscribed from all my addons and removed them in steamapps/Garry’s Mod and STILL it has the same problem. Can someone please help.