Black Screen

I can start Gmod and use the main menu but once I join a server or load any map, I’ll get a black screen and then I can’t open any GUI what-so-ever. Any help?

Press ~ ( console key ) once, and type pp_fb 0 or wait for next update.

I have the same problem!!!D:

[editline]6th July 2014[/editline]

whats console key

The key that opens console, by default its ~, tilde key, the key above TAB, left to ONE, under ESC.