Got a 27' monitor two days ago and for some reason TF2 don't render fullscreen on it. It starts up in a windowed mode where it shows the Valve startup bits before freezing with just sound playing. Like this.
I tried the 'fullscreen' in Launch options but it still doesn't work. Also done 'Alt+Enter' but still nothing. All my other Valve games and all other Steam games work fine. Any ideas?

I tried the 'fullscreen' in Launch options but it still doesn't work. Also done 'Alt+Enter' but still nothing. All my other Valve games and all other Steam games work fine. Any ideas?