TF2 not launching (and Garry's Mod)

[cat]

Here's what happens, I press play, and it says it's running, and then the screen flashes to black for about 0.2 seconds while 'Syncing', and closes. I have disabled steam cloud, reinstalled Steam and TF2 multiple times, used various launch codes, verified my game cache 4 times, contacted Steam Support, mad a autoexec.cfg file (which didn't work either), and all of my drivers are up to date. I can even run Rust normally. It might have something to do with the hl2 engine or whatever, since the same thing happens with Garry's Mod. Please help, my specs are Operating System - Windows 10 System Manufacturer - LENOVO System model - 80 NV Processor(s) - Intel (R) Core(TM) i7-6700HQ CPU @ 2.60 GHz (8 CPUs), ~2.6GHz Memory - 16384MB DirectX Version - DirectX 12
Generic PnP Monitor
NVIDIA GeForce GTX 960M