I discovered today that my old oven was not dead after all. It's just got some problem with the socket. One of the small wire seems to be faulty and generates some little sparks if I moves it, pretty dangerous eh?
I've decided to KIV the old oven and think of what to do with it. Perhaps I'll change the socket and use it for oily dishes (like grilled chicken wings) so that I can protect my new oven for a little while.