I had this problem the other day, at first I thought that the battery had completely discharged and that I had to wait until it charged up, but it still didn't do anything. In my case, it turned out that I had somehow changed the brightness of the unit down to 0%. I think this happened during one of those times where it's was supposed to be sleeping but wasn't.Anyhow, I took the Power Control widget off my main page and replaced it with the widgets from the Ultimate.zip because I mainly wanted a quick way to turn off the wifi controller.In my case, I couldn't see anything in an indoors setting, and happened to notice it when I looked at an angle in the sunlight.Hope this helps someone else!Jeff