This question requires a techincal person to first, attach an external monitor to the laptop to see if there is video going to the external monitor? Then while the external monitor is hooked up he should run full diagnostics to see if the motherboard video adapter is fully functional? If it is? He has to open the laptop and trace to see if the plug from the motherboard to the monitor needs to be reseated. The worst case scenario is you will have to replace the motherboard.
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