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Possible loose socket connection or power wire broken inside power cable. Bend the power cable with your hand while the unit is on and try to reproduce the problem
most Garmin's are powered by external sources which charge the device. the device has a battery internally and is kept charged by such a cable connected to the cigarette lighter socket.
If its a built in Garman then most likely its the fuse.
Go to Garmin and download and install Garmin Express, Plug your GPS into your PC. The GPS should power on and Garmin Express should identify it and tell you of any updates. This would allow your to install new maps. You did not delete your internal memory, you deleted your internal maps. Moving the maps from internal to external memory cannot be done on your PC and have them work. They have to be installed on the SD card via Garmin Express. https://support.garmin.com/faqSearch/en-US/faq/content/b17m7lCO3R4UKUAt8x67J7
My 182C developed the same problem. It appears to be a problem with reading data from the card. When I power up the unit, sometimes it will display "Reading Card" for a long time and no data will be read. I've found that if I open the latch and push in on the card as I press the power button, it will only then display the number of maps loaded. Sometimes less than other times. Most times a lot of data is not loaded from the card causing the problem frankcps describes and other problems, such as no data for tide stations, anchorage, etc. I tried cleaning the contacts on the data card & where it plugs in, but still continue to have the problem.
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