Why is my Lenovo All in one A340 22WIL screen flashing and flickering?

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A A2872

I have a Lenovo all in one of and a few weeks ago the screen started flickering and blinking when I was using it. The bottom quarter of the screen in black and the screen is dim.The pc has never been dropped or hit.I have tried updating my driver and reinstalling them when I open task manager it flickers as well. I have replaced the LCD cable inside the pc but nothing seems to be working.When I put my Pc on BIOS it still flickers.Could you tell me how to fix my Pc please

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