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I have a Magellan 760 that turned off while I had it working on its
window mount. I was not able to turn it back on. It's like it over
heated and a fuse burned out. What part do I need to fix this up?

If you say it overheated are you saying it got physically hot, is there the smell of burned electronics? If so, your logic board needs repair. If not at may be as little as a loose DC-Jack module are software issue.