Viridian Room

ARRRGGHHHH!! I'm about to chuck a computer rage because of this addictive flash game!! After successfully negotiating my way out of Crimson Room, Viridian Room is proving to be a much harder nut to crack. I'm one item short of collecting everything and even after that, I have absolutely no idea what to do. Place the CD into the case? Light the incense sticks?

*think...you are an engineer...*