I see. Well then you could try seeing if it will fully load in "Safe Mode". It will restrict access to things, so not something you would stay in, however if it will load while in "Safe Mode" then you know there is something on the device that needs to be removed. Bad app(s), bad update, malware, virus, etc.
To get into "Safe Mode" please do the following.
1. First turn off the tablet.
2. Next press and hold "Power" until you see the manufacturers logo on the screen, then release the power button.
3. "Quickly" press "Volume Down" and hold it for few seconds until you see the message "Safe mode: ON" or something similar.
4. If you wanted disable it, simply repeat the steps above, and you should see "Safe Mode: OFF" rather than on.