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I had something similar happen with mine, and after searching online for the solution, I discovered that holding down the power button while pressing down on the volume bar at the same time somehow trips everything back into operational mode. It may not work the first time, it didn't with mine, but just keep pressing both at the same time and sooner or later you will have a screen appear and be able to use your tablet once again. Hold both down and press repeatedly.
The charger plug should plug into the mini-USB port. This is the same port for the USB cable that would connect to the computer, and in fact the tablet can be charged from the computer if the computer is on.
Odd, but try this: Some tablets do not fully shut down, even though the screen goes blank. Hold down the power button for 30 seconds, wait 15 seconds, and then try again to power up (hold power button for 3-5 seconds). Wait patiently for the power up, as power after factory reset may take longer than a 'typical' start-up. Good luck!
Sounds like you have far too many apps installed all demanding cpu and network (wifi) work even if they aren't open . Have a purge and be ruthless! Get rid of every app you don't use. Try and stay in same room or near to router so it's wifi doesn't have to use high power to stay in contact with it. Reduce the screen brightness as much as you can. looks dull at first but you soon adjust and get used to it. Remember the usb keyboard is also getting it's power from the tablet battery and will use much more than the touch screen does. In my experience the batteries on these are quite small. There is enough space inside for a battery 3 times the capacity of the one fitted. You might want to consider getting the battery replaced with a higher capacity one,. There's videos on youtube how to do it, or you could ask a local computer repair shop for a price.