Garrys mod not loading

[ACPascal]

Whenever I try to open Garry's Mod it says "Preparing to launch Garry's Mod" and doesn't start. Help?

[c👌de_g🎷]

If it doesn't even launch at all, it's an issue with Steam. Try launching it from the executable in steamapps/common/garrysmod

[Skiyo]

Try verifying the Game Cache....