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This can be an issue with the Firmware, so I would first like you to do this please.
Remove the charger from the Garmin and hold the power button to off for 60 seconds.
Release, then connect the charger and try to turn on the unit.
Let me know the results please
Are any lights showing at all when you connect the charger?
It is the internal power supply on the mainboard that has faulted. It is very likely you did connect a charger with a higher voltage (Laptop chargers are) and this will have burnt it out. You likely also damaged the batteries, but you need to stop connecting it now and replace the unit to avoid any personal damage in the event (if left connected for extended periods of time) it starts to overheat.
I am really sorry about this, and if you have problems, or would like any additional information or assistance, please do not hesitate to let me know.
And if you can take a second to rate my service by clicking one of the stars at the top of the page, then submit, that would be greatly appreciated.
It is not economically feasible to repair as the cost of the mainboard plus a limited warranty would exceed the value of the unit, which is why no companies offer this type of repair.
I am not saying it will get hot straightaway Zac, I am only indicating that when you damage the power supply in the manner you have, it is advise to not have it connected as there is a good chance that it can end up overheating.
No, as the Garmin would work if connected via the cable directly as then it goes first to the Garmin and then to the battery. You always know the battery is at fault if it works on the mains but not on the battery.
No sorry (and sorry for all the bad news but I need to be correct and realistic in my replies) but with no power being delivered there is no way to engage the memory.
If you need anything else, please let me know
And please remember the service rating via one of the stars at the top of the screen then submit