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Hello everyone, I have a problem with my HP Laptop

IDK what caused it since it was working just fine before this happened, but one day I'm starting my Laptop (I turn it on literally everyday, not proud of this but sometimes keep it on for days), and then it displays a blank screen, the screen is on, but nothing but a blank screen, no image display, I tested out my laptop with an external monitor, it works just fine, for the first 2 days, the screen flickered, working but when i start it up it stays blank for a while, flickers, then works, flickers again if i hit the desk (away from the laptop itself) flickers as in going blank in parts but displaying in parts, all goes all blank then displays again the image, with some very fast disappearing white parts with black dots in it, now it's the 3rd day and it just displays a blank screen and I'm working on an external monitor, now i don't think it's the motherboard nor the graphics card since the second screen works perfectly fine, so could it be the LCD itself or the LCD Cable, if the latter, is the cable faulty or does it just need to be reconnected properly?
Also, what can possibly cause this?

thanks in advance

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