Autocad 2007 3d HELPPPPPPPPPPPPPPPPPPPPPPPP

ok, im a college architect major and i know autocad really well until this stupid program wouldn't let me have the lighting function on. just a few hrs ago it was working just perfectly FINE, everything was going smoothly until something happened and i do not know WHAT and im getting PISS OFF. i tried on 3 different computers and samething happened, so its my file that i was working on. i also made a new file and made a quick box and checked the light and it worked fine so its specifically my file.

here are the pics of what i had when i was working on it and what it is now for every image i try to render everything is DARK, no lights or sun even they are on and i do not know how to fix it so PLEASE help me since i need to finish it by tomorrow. im done with everything all i need to do is render it.