Preparing to launch Rust > Syncing

I recently bought a new GPU, everything installed and updated, Rust runs better then it used to.
I decided to buy a better SSD hard drive, everything installed and updated, double check, triple checked. I can play Rocket League, League of legends, ect… When I try to launch Rust, I get preparing to launch Rust, then the window disappears, than Rust has syncing next to it in the Steam library, and that’s all. If I run in Directx9, it will crash on the loading screen with an error message. I have tried multiple fixes from the world of Google. Un/Reinstall Rust, Un/Reinstall Steam. None of it works, but if I plug my old SSD back in, Rust works fine.

Any help would be very welcomed!