Why isn't my Nexus 7 (2012) booting up?

so i was using my n7 yesterday, turned it off at about 35% battery and next day it wasn't booting up anymore.I tried everything i could find on the internet:
1.holding the power button for 30 seconds
2.holding power+volume up/down or all three
3.opened the back ,removed the battery connector(with colorful wires) and reattached it.
NOTHING worked. any suggestions?
PS i also have been charging it (using stock charger) for like 5-6 hours.Charger becomes hot but the tablet doesn't. Also the screen doesn't flicker or anything it's totally unresponsive.

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