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Laptop 9400 screen black

Dell laptop screen is black after using the VGA cable to engage an exterior monitor ( Flat screen TV). I disabled the internal laptop monitor to enable the external screen to be primary screen but this failed. But now I am unable to reengage the laptop screen from its blank state. I tried internal diagnostics. and FN & F8 key (CRT/LCD) still have black screen. Thanks for your help.

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