Good link, TMPilot. Thanks.
MacDoc, I forgot to include one preliminary and easy step. In the photo I linked, find the rectangular black plastic cover near the top of the unit. It has a white label on it, and you can see the word "Important". Although it is hard to see in the photo, there are two round spots on this cover, each about the size of a quarter. These are overheat reset switches. Simply push each one firmly with your thumb. If one of them clicks, you may have found (and fixed) the problem.
Bill
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