Skyrim Won't Start

Hey everyone. My Skyrim is crashing after the bethesda logo, and I haven't installed new mods. It crashed while I was playing the Dragonborn dlc. Now it won't start. I've tried validating cache, yet it hasn't helped. I own both Dawnguard and Dragonborn, so it can't be caused by those either. I'm very puzzled, especially since I haven't added any new mods or updated. I use the SKSE launcher. 

Any ideas? Thanks for the help. 

Try launching normally w/o the SKSE launcher, restart computer, restart steam (if using steam)

A horrible 4 hours of re downloading and re installing every single mod has fixed it...
I have no idea what could of caused it