Could be that the fuse has blown out. This happened to the one that my wifes office had. They had bought an extended warranty, and only had it about a week when it stopped working. They called Office Depot and they replaced the shredder and left them the old one. My wife brought it home and thats when I found the blown fuse. Since then it has started making noise and shredding in consistently. I again pulled it apart and have since found that the gears seem to be wearing out. From the reviews that I have read the shredded is nothing more than an expensive paper weight.
Richard
January 2009