My samsung tab pro 12.2" wont start

My samsung tab pro 12.2" is not starting. I plugged in the original samsung charger. The charging indication is there. After 100% charging, I tried switching on The Samsung logo comes up- after that nothing happens. I held the power button for 5 to 10- 15- 20 seconds- same status- The logo comes up and nothing happens after that. I left the tab in that condition and I see that the battery gets discharged in 2 to 3 hrs. ( the tab is warm during this period) Again I went through charging cycle upto 100% charging, and repeated the same- status quo- logo comes up. I tried even holding home+power button and holding volume+power button simultaneously- Same response from the tab- Samsung logo comes up and freezes...
Any idea from any body?

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