Try to connect the Garmin using the USB cable to a PC. Does the Garmin go into communication mode? If so - load MyGarmin.com on a PC/Mac and try to update it to the latest available software version (if available). Be sure to connect it to a wall / car charger to avoid the battery running out while updating.
If communication mode doesn't start - power off. Then press the On button for at least 20 seconds for a soft restart. If no response, try a master reset reverting back to factory mode. For this power down - then press the lower right corner of the screen for at least 20 seconds while pushing the On button. Wait for a question to appear to clear all user data.
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