Chosen Solution
When the MarquisPad is plugged into the wall it will not gain a charge.
Refer to Matsunichi MaquisPad MP977 Troubleshooting
Mine has the same problem.
Both my kids have this model and they are not taking a charge. After troubleshooting discovered the pns in the power port are damaged from possibly plugging and unplugging the power cord. So the power is not connecting with the device. The replacement piece is about $17 on Ebay. 30Pin Connector For Repair MATSUNICHI MARQUIS MP977 USB Data Power Charging Port