I can only suggest that you insure that you have fresh batteries, and that they are installed properly. If you had batteries sitting in it, and they leaked, you might want to examine the contacts and make sure they are clean, and not corroded.
The Etrex are sealed and water-tight. Opening the unit will make them no longer able to resist water as well, and if there is anything wrong internally, it should be sent back for factory repair.
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