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This is usually an issue with the Firmware, so I would first like you to do this please.
hold the power button to off for 60 seconds.
Release, then connect the charger and try to turn on the S1.
Let me know the results please
OK, open Garmin express, connect it to a different USB port on the computer and tell me if it is then detected please.
It is the internal mainboard that has faulted, a faulty cable would still let it charge
I am really sorry about this and you are going to have to return the unit to have it replaced. It will be covered by the warranty if this has not expired, and the replacement will be done at no cost to you.
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.
I understand Dean,
If you need anything else, please let me know
And if you can please do the service rating via the stars at the top that would be appreciated.