If you turn on your laptop and no display ever shows, your issue is with either the LCD backlight or the motherboard (since the video card is built-in the motherboard). This will be easy to diagnose.
1.) Plug an external monitor (one which you know works) into the VGA port of your laptop.
2.) Turn on the laptop.
3.) Hold down the FN key (lower-left corner of the keyboard) and press the "CRT/LCD" key (it will be located on the number keys or F1-F12. You do this to tell the laptop that it needs to send the video signal to the external monitor instead of its built-in LCD screen.
If you can see a display on the external monitor, then the issue is with the laptop's LCD screen (about $200 for the part plus labor to install). If you can NOT see a display on the external monitor, then your problem is with the motherboard ($300-$500 for the part plus a lot in labor cost for installation).
Possible that the LCD panel is faulty , possible that the linking wire to the LCD panel is open.
Connect an external display to the PC and if the PC boots and works without any issues then the fault is associated only with the display. It can be a power issue to the panel, loss of back light or drive from the motherboard.
You need to trace and check continuity from the motherboard to the display unit to confirm.
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