Hi everyone. I'm nearing the end of Chapter 5 but have gotten stuck. I have assembled the four tones on the MP3 players and the four symbols I need to combine. I am at the sofa and facing the table and found the action symbol, but I can't make anything happen. I've checked the walkthrough and know what needs to be done, but nothing happens. The items I want to place aren't highlighted when I put them over the table.
What am I doing wrong? I've gone over the WT and have done all the steps leading up to this section.
Help!

Gail