Go to the fifth floor where Neville is. Defeat Malfoy and his gang. You will instruments that are alive so destory them. When you enter the room be Ron open the box (there will be a big surpise). When you are at the balcony, go the room and you will find the spell, Lumos Dumos. There will be little ghosts with lanterns called Hunkypunks. Use the new spell on one of them, when it is visible use flipendo and defeat then. When you are finished, go to the orb and light it up with the spell. Go to the door. There will be toys thats attacks. After them, there will be robot toy that shoots mini missiles. When it opens out the missiles, use flipendo at it. After you defeat it, light up the orb and the cage will open. Get down from the balcony and cast the spell on the Ghoul and back it up to it's cage. Thats all so good luck!