Dv9700 no screen display

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Jul 21, 2011
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I have alreeady replaced the mainboard, the display panel, the inverter and the display cable. But same out come, the laptop powers up fine and everything, you see the laptop light up and fan kick in. But I would only get the picture once I have this laptop hook up to a external monitor. That's the only way. I checked the device manager, the display driver is nvidia but that seems running good. But the actual monitor driver was not there, the only avaiable driver of the monitor is external monitor that is hooked up to it, which it does prove the nvidia gpu is still good, but still will not display a good working picture

Please help:[