TOPIC: Reasons

Does it come up with any error messages?

Ik dosnt work on my other computer it says hl2.exe would not start

you could try removing some of ur addons

Try right click Gmod on steam, go to properties, then click set launch options and type in "-sw -dxlevel 80" without the quotes.

try to unsub too all addons reinstal and set your resulution a bit lower then native that worked for me i had the same problem