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I have a Garmin 810 that won't startup.

When I turn it on, and it gets to  "Loading maps..." it sits there for a few seconds, then the screen goes blank and it beeps once.  If I plug it into a computer it does say "transferring to mass storage..." but then the same thing happens - screen goes blank, beeps once, and is off.

I can force it to go into mass storage mode by holding down the lap button when plugging in the USB port to a computer.  Then I'm able to navigate the files/folders no problem.  I tried deleting all of my Courses from the device but that didn't make any difference.

Any ideas?