Re: I have no idea
If you ever have to deal with users then the very first thing you find out is that they never know what they did before something failed/went bang/died or whatever malfunction now ails the machine. It is always essential to perform your own walk through. In the case of the toaster is it plugged into a socket that is turned one has the machine any signs of miss-use etc. Always work from first principals.
Guess work will take you down more rabbit holes than even the rabbits ever knew existed.