I have a Nabi that all of the sudden even if the green light is on saying its charged the screen stays black
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.
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