Making a new thread because it relates to multiple problems I've been having where existing solutions on the forum have not worked:

Problem List That I've Had Today:
1. Getting stuck on "Loading...0%" in launcher
2. Getting stuck on "Launching" in launcher
3. Getting stuck on the splash screen (Diablo's face) when loading the game

Resolution:
1. I had the game installed on an external hard drive (USB). I moved it to my primary one by copying the files over and re-opening the launcher. When the launcher moved to the yellow status, I could successfully launch the game.
2. The servers are down so I can't actually test playing the game but at least i got to the login page.