After installing the BIOS on Hp G72-a10EM screen is black.

Hello everyone. I have a problem on my laptop. When I upgraded the bios and successfully installed the laptop  rebooted but the screen stayed black while everything else seemed to be working normally. I tried to connect an external monitor to the VGA output on the external display I've got a normal image and the windows are raised normally.
I tried to get back into BIOS setup by default but i still do not get a picture on the screen of the laptop.
If someone had a similar problem or can help in solving this problem, I would be very grateful.

Hey @Zhiksy ,
Did you check the inverter or LCD cable connection page 133 of your manual. As if it is showing on a monitor it is not the processor graphic card or Ram.
Thanks
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