I need to locate a manual for my nabi big tab HD 20". Are there any sites that can give me this?

Link to pdf of user manual at internet site below:

https://www.amazon.com/Nabi-FCN95-nabi-Elev-8-Tablet/dp/B01HP6G1U4

You have a defective operating system or circuit board or processor chip, whatever the reason, so the best thing to do is just buy an new one.

1. Turn off your nabi Big Tab.
2. Press the Volume - button first, then press the Power button and hold them both until the system menu appears on the upper left corner of the screen.
3. Use the Volume - button to highlight "Recovery Mode," then press the Power button to select it.

More items...

I Need to Perform a Factory Reset on My nabi Big Tab

https://www.nabitablet.com/.../nabi.../i-need-to-perform-a-factory-reset-on-my-nabi-big-... How do reset the nabi tablet Google Search

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4' Charger Cable for nabi Jr. & nabi XD kid tablet - nabi Shop

shop.nabitablet.com/products/4ft-charger-cable-for-nabi-jr-nabi-xd

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forum.xda-developers.com > Fuhu Nabi 2 > Nabi 2 General

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www.gizmag.com/nabi-dreamtab-kids-tablet-hd8.../34762/

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Rating: 2.5 - ‎Review by Anna Attkisson

Sounds like you have a good charger/cable, so try resetting the Nabi that's giving you trouble. Hold the power switch down for 10-20 seconds to reset the unit.
I have a couple of NABI-2 tablets and they both react differently to the charging cables; I often have to shut the NABI off completely to charge them. Also, getting the charging cable to connect can be challenging - I will plug the cable in and out several times waiting 10 seconds or so to see if the green LED will go red.

I found the support page for your product that has links to everything you should need to know about your tablet.
nabi Jr Support

sounds like your screen broke. Nabi has 2 'scereens' a piece of glass on top, then the LCD screen below. The LCD screen can be broken by hitting or twisting it. It can also become more prone to breakage if you leave it out in excessive heat.
Nabi will fix the screen for about $60...

I fit is a new tablet, I would take it (/send it ) back to supplier and complain and/or ask for a replacement.
If it is not new, then... hmmm.