Thank you Soul, I made it a window and now it works. I appreciate the help~

I did what you suggested, but I still have the same problem occurring. After I verified the integrity of game cache, it said, "1 files failed to validate and will be required." Any other ideas?

Alrightly, so I have included a screenshot. Heh, it doesnt look like anything but the black bar in the top right hand corner is supposed to be gmod. While I was trying to fix the resolution on gmod and somehow I messed it up completely. Britishguy suggest uninstalling and installing it to reset the ...