Can be used normally. The sound made by a beautiful toaster when it is electrified is the sound made by its internal operation. If it doesn't work properly. The most common problem is that the bread machine can't make dough, which is the simplest case. This is not the problem of the bread maker, but the yeast is not put in the right place, or the yeast has exceeded its service life, which is the reason why it doesn't work. At this time, just replace the new yeast and put it in place.