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This could be a battery issue, and we may need to discuss replacing the battery. You did well to get a new usb cord, as that could have also been the issue.
But before we discuss replacing the battery, lets try the following first.
To perform a hard reset you will need to locate the reset button. The reset button is a small, circular hole next to the charging port on the tablet, beneath the flap. You will need a paperclip, pin or something similar to press it. Press and hold for about ten seconds, then release. The tablet should boot normally.. ( or hopefully, start to charge )
Let me know if the charging light will come on or the tablet will boot after the reset. If not, we can discuss further steps as needed.
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