i815 won't turn on!!!!

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http://forum.xda-developers.com – Tab: SCH-i815 7.7 ROM: Cyanogenmod 10 (locerra) Background: Used last night, 40% charge. Set down by my bed. Left unplugged all day. Device left for 19 hours. Because of the CM10 ROMI was running, there is a lot of battery discharge when sleeping. I am sure battery died overnight or during the day. Situation: Device wont turn on. Plugged into charger for 2 hours, nothing. unplugged and replugged to charger. Held button for 15 seconds. Tried a different charger. Screen just stays back. I am going to bed now so can't reply until tomorrow. Help?!? (HowTos)