Having trouble with a gear

Hi, I am playing the easy game and I am in a bedroom and I have found all objects and have just completed the square game where you have to beat the computer and get more squares out. I have one object to find, dress coat?, the gear shows over a chest of drawers, and I am clicking but nothing is happening, I assume that the drawer opens? I can hear a sound as if a drawer is opening but nothing is happening. Has anyone got any ideas or help please.

It's OK, I found out that you had to use the key.