Nexus 7 will not charge or turn on.

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http://androidforums.com – I'm using the first gen Nexus 7, 3 days ago I let it charge overnight when I woke up I saw that it didn't charge, so I took it of the charger and put it back on but it didn't charge and my Nexus 7 ended up dying. And now when I plug my Nexus 7 up to charge it doesn't also when I hold the power button down the battery/charging icon shows up empty and then the longer I hold it it comes up the same. Iv'e already tried holding the volume button down with the power button but the battery/charging icon still shows up empty. I just need to know if this is the tablet or the battery and how much it wi (General)