Black screen after on native screen only hp logo, but the external monitor is ok

Hello everyone. HP Pavilion dv9700.

The graphics card has been burned, and I ordered the new motherboard of eBay and replaced it.

The problem is:

When I turn on the unit, the native screen flashes once the HP logo then it becomes black. If I unplug the video cable and connect the external monitor, it works perfectly. The same thing with remote access. I start with a blank screen, and I can connect remotely to the laptop.

What did I miss? where to look for potential problems?

the problem has a link between motherboars and display.  I could see the screen by moving the display cable. Maybe it's because the poor quality of the motherboard, I bought

Tags: Notebooks

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