Can someone help me with my Gmod??

So My Garrys mod says (Imput not supported) and i cant do anything with it… I hope someone can help me. Thx for reading and sorry for bad English.

(User was banned for this post ("Wrong section" - Gran PC))

Help and support forum bro… Use it.

And By Input, I assume you mean resolution? If so, just change it?
You kinda gave us a very vague description. Post a screenshot or something

A screenshot and your computer specs might get you somewhere.