My Doom3 now plays only in a window on my desktop. How do i fix it?

[laffTrax]

It probably seems like a stupid question but every time i open Doom 3 - it now pops open in a window on my desktop. It never "clicks" and switches to full screen anymore. I tried to maximize it and cannot seem to get it. How do i go back to FULL SCREEN?

THANK YOU ANYONE!!!!!!!!!!

[jAkUp]

set it in the graphics options, change it back to full screen mode

[laffTrax]

THANK YOU!!!!!!!!!!!!!!

It worked!

(yes, i'm an idiot)

[kyleb]

alt+enter also works.