This issue has been happening with me recently, and have usually found ways to fix it. However, this time I have tried everything there is and GMOD still won't start up.

The problem is, whenever I try to start up GMOD, it has the "Preparing to launch Garry's Mod...". After about a second, the small box disappears and nothing happens. In the past, I have re-installed GMOD then restarted my laptop and then it would work fine. The thing that would fix it is a Steam update. But sadly, it won't work now. Is anyone else having this problem?

Video showing what this looks like:
https://www.youtube.com/watch?v=xxEsorz9gKo



P.S. Can someone show me how to turn the video from a link to the actual video in the post? Thank you.