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Lets try this reset as it may get the device working.
If you still cant get the device to turn on or show any signs of life whatsoever, t hen Id suggest returning the device to Garmin for a free exchange.. To do so, use this link and follow the steps to Request an RMA. http://www8.garmin.com/support/warranty.html
The RMA steps are towards the bottom of that page.
I strive to provide great service, and greatly appreciate a 5 star rating clicked and submitted when you are satisfied.. I always answer follow up questions.Dustin S.Senior Technician and Network Switching Systems Operator / Maintainer.