Won't Turn On

There could be several problems some painful some not so much, the simplest one is bad wall plug or bad plug wire, the hardest is that the motor burned out, but i don't think so. The most likely solution is the speed control switch. There are three scres on the switch in an inverted triangle shape/form. The one on the bottom has probable been turned just enough to stop your mixer from working. The speed control switch that you use pushes against the screw every time you turn your mixer on eventually it can turn by pressure and it will shut your mixer off with just a 1/16th inch turn. It is a very simple fix.
Where is the speed control switch? Glad you asked. It is in the rear of the machine. There is a round bubble shaped cover at the rear of the mixer called the end cover, it has one screw (Phillips head) on the top. Take that screw out, then grasp the cover and lift up and away from the mixer. Be careful there are two fragile hooks on the cover that can break if you twist it left or right, just lift up and pull away. when you have removed the cover you will see a black and copper plate staring back at you (it might be all dusty with flower and food particles) look for the adjusting screws at the top left and right corners and one at the bottom center of the plate. The one at the bottom center is the culprit. Take a Phillips head screwdriver and turn it left an eighth of a turn and turn the machine on, if it doesn't work leave the machine on and turn the screw in the opposite direction . ill bet a steak that the mixer starts. if it does you need to replace the speed control plate or take the screw out and put some lock tight on it. BUT!!!! when you do this you will have to completely re-tune the speed of the machine. So if it starts just leave it and you may have to do this once or twice again in the next ten or twelve years. Let us know if this fixed the problem. there are several other possible causes that could make the mixer stop but they are more painful.