My problem exactly. Unit would start up, acquire satellites, then the
screen would go blank with a single vertical line. Unit would not
respond to buttons or even turn off. Unit works fine after I did the
reset:
- w/unit OFF, press and hold QUIT+DOWN+MENU
- press and release the power button, release DOWN, keep holding QUIT+MENU for 5 seconds.
- unit prompts something like: "erase all data;" choose yes.
- you will lose waypoints, etc.
Go to the Garmin support area for details.
http://www.garmin.com/garmin/cms/site/us/support/searchsupport
Search for: "How do I reset my gpsmap 76"
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