Not heating (by 3 users)

I also have a JEB1095 and it is about 5 years old. The unit runs (light comes on, Timer works) but it does not heat anything.
What could the problem be?

Our unit seemed to work when heating a cup of coffe (light came on and timer worked) but when done, the coffee had not heated. Tried again and it made a nasty noise. Our warranty covers the cost of the magnatron (up to 10 years), but not the service call to install it or anything else that may be wrong. Unit is 5 years old. Should we try to fix or replace?