Gmod Main Menu Screen Messed Up

Alright so i was screwing around with my screen resolution this morning when something got messed up with the main menu and i have absolutely no idea how to fix it. The screen is stuck in the upper left hand side of my moniter and everything else is black, leaving only a few inches of the menu visible . I have tried uninstalling it, reinstalling it, restarting my compter, deleting the gmod file and then reinstalling it. Nothing works. Please help!

nobody has any ideas!? anything would be appreciated!

You shouldn’t mess with stuff if you don’t know what you’re doing.

There should be a boot option to help you out. You’re going to have to use Google to find it, though, as I can’t recall one to the effect.

Haha oh i knew exactly what i was doing. Ive had gmod for about 3 years now and ive changed the res a couple times already but ive never had this happen.Anyways thanks for the response but could you clarify what this boot option is?