Your tablet must have either a faulty screen or display. If there is visible damage to the screen, this may cause the touchscreen to be unresponsive. If the screen is undamaged and clean, then the problem must be the display, in which case it needs to be replaced.
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Your tablet must have either a faulty screen or display. If there is visible damage to the screen, this may cause the touchscreen to be unresponsive. If the screen is undamaged and clean, then the problem must be the display, in which case it needs to be replaced.
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Follow this [http://www.ifixit.com/Wiki/Nabi_Big_Tab_HD24_Troubleshooting|troubleshooting guide] to determine what the specific problem is.
Your tablet must have either a faulty screen or display. If there is visible damage to the screen, this may cause the touchscreen to be unresponsive. If the screen is undamaged and clean, then the problem must be the display, in which case it needs to be replaced.