When I open Garry's Mod it turns my screen.

So I recently bought Garry’s Mod on Steam I downloaded it and when I opened it, it didn’t open itself I had to click on it in the tool bar and when I did that my screen turned black and it turned its my screen. It wont open even if the screen is turned.

No idea what you said. Are you using google translate? For general graphics issues, try updating your graphics drivers