Just to be sure ...
Here is the way to reset the Garmin edge :
Soft reset : hold mode and lap/reset buttons for 10 seconds
Hard reset : device should be powered down, hold start and mode buttons for 3 seconds then pulse press the lap/reset button.
After soft reset, you need to hold start button for up to 10 secs before it starts.
After hard reset, you will loose all your data, including profiles
Now if this does not work, you should check battery. Does the device charge when plugged on PC ?
If it does not, either battery is out of order or the contacts inside the device re broken. This may happen if device is used in continuous vibrating environment like mountain bike.
Changing battery or fixing contacts issue is explained there :
http://blog.mtbguru.com/2008/11/06/surgery-on-the-garmin-edge-305/
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What about battery ? Is it charged ?
Did you try to plug it on PC ? Sometimes reset works better when plugged.
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