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First I will suggest you to Return BIOS settings to their default levels. An overclocked or misconfigured BIOS can cause all sorts of random issues, including black screen After that restart your computer and then press and hold F8 keys until you get Advanced Options menu screen.Use the arrow key to highlight Safe Mode, and then press Enter, your computer will boot automatically to safe mode. If you able to start in safe mode then update your graphic drivers from the manufacture site of your laptop Let me know if it helps you. Use system utility tool like RegInOut to remove unwanted files , fix registry and windows errors which causing black screen
It sounds like the graphics card or on board graphics is causing the issue, as the external monitor is not working either. Hopefully its a graphics card which can be replaced easily, or there is an expansion slot for a graphics card to be added. One thing you could try is resetting the CMOS by removing the battery from the motherboard and leaving for ten minutes. Replace the battery and try booting.
Hook a spare monitor to the video output on the back of the laptop, If okay! the LCD display on the computer is the issue, cause, the inverter board is bad "most likely" that powers the back light, the less likely is the back light behind the screen. But if both screens show the same problem it is the video graphics card that is part of the motherboard. I suggest a computer tech.