Hello, Sorry you're having problems. Offhand it sounds like the Garmin may indeed have a hardware fault internally requiring service. However it would be worth trying a hard reset via Garmin.
Please plug the unit into the car's DC charge cable then turn the accessory in the vehicle ON, then press and hold the power button for 15 full seconds and release. Check and see if the Garmin welcome screen finishes rebooting and loads the maps. If not then let me know what exactly shows on the screen and we can proceed.
Please first try that, and if the GPS still does not stay on then check the car end of the charger and let me know if the green light is lit on the plug in that fits into the vehicle. If it's not- then you have a failed fuse or faulty charger. Let me know what you find.
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I'm unavailable by phone and will be continuing with you on this page. Check the car end of the charger and let me know if the green light is lit on the plug in that fits into the vehicle. If it's not- then you have a failed fuse or faulty charger. Let me know what you find.
Is the green light lit on the charger please, yes or no?
Then you have a hardware failure in the GPS unfortunately which requires service via Garmin- unfortunately there are no other pushbutton attempts to fix this problem. You can setup an out of warranty repair ticket with Garmin at the link below if you'd like:
Other than that, I'm sorry for the bad news here and wish there were a quick fix.
Do you need further assistance with this?
The reboot I posted above is the only one on a user level you can try I'm afraid. Beyond that they require repairs. That said, are you a DIY type and looking to disassemble and fix these yourself?