Are you sure you did the reset correctly? Also were you doing just a "Factory Reset" or a "Hard Reset". The former people tend to try because it 'might' not wipe all your personal data. However if you were doing the reset due to a possible software problem, virus, malware, etc., then it would be better to do a full on "Hard Reset". I will include the instructions below on how to do that.
Now if you did actually do the "Hard Reset" and it is stuck, you may well have to shut it down and then restart it. You may also have to do the rest again. Sometimes devices are finicky. Also, make sure there isn't an SD card in the device when you do the reset. That can make it not work correctly as well.
NOTE: Doing this will clear 'all' the data on your tablet, so it is suggested you not choose this option unless you have to, or aren't worried about losing anything on the device.
Be sure you back up any data you want to keep, to a computer or cloud account, before doing the reset.
To "Hard Reset" the tablet...
1. Make sure that the tablet is actually powered off.
2. Remove your SD card, if there is one in the device.
3. Press the "Power" and the "Volume Up" buttons, together, until you see the start-up logo on the screen.
4. Once you can see the logo, release the buttons and allow the device to enter the "System Recovery Mode".
5. Next use "Volume Down" button to get to the "wipe data/factory reset" option When in recovery mode the "Volume Up" and "Volume Down" buttons are how to can navigate and highlight what option you need.
6. Once you have selected the "wipe data/factory reset", press the "Power" button to select that option.
7. On the following screen, repeatedly press the "Volume Down" button until the "Yes - delete all user data" option is what is selected.
8. Then press the "Power" button to hard reset the tablet.
9. If you took your SD card out in step 2, when the device is up and running again, reinsert the SD card.