Forerunner 265s died and won't turn back on.

My Forerunner 265s battery died.  It had more than 80% battery life.  It won't turn on.  I have checked the ports and the cable is in a proper working condition.  I have tried holding the light button for 30 and 60 seconds.  When I connect it to the computer and open Garmin Express it doesn't pick up the deivce.  Please help me fix this.