HTC Jetstream will not pwr up.

Yesterday my battery was low, so I connected the charger in order to complete a long Skype call. I kept the charger on overnight. Today I was unable to power up the screen. I changed to my 12 volt charger for an hour, but no luck. I tried the wall charger again and confirmed the flashing amber light on the power button. After 15 minutes I tried the power button again---no luck. I have had the tablet for about 5 months.

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