Try to star up my nexus 7, what I get is a blinking light, what does that mean?

Try to charge my nexus 7 when it get down to 20% battery life. The screen showed 'charging' and I turn off the screen. After a few hour instead of charging, the battery got drained. When I push the start button, all I got is a blinking light. I unplug the charger and plug it in again, got a blinking light too.

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