When turn on, my dell laptop shows black screen
Follow the steps below to restore your computer to the Last Know Good Configuration
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Reboot your computer.
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When the computer starts up, press the F8 key on the keyboard repeatedly.
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This will bring up the Windows Advance Options Menu as shown in the picture below.
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Push the Down Arrow key on your keyboard until you get to Last Known Good Configuration (advanced) option
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Press Enter
Running this configuration will restore your computer’s working system settings without deleting anything on your computer.
The second thing to try is to perform a Built in Self-test. To do that:
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Turn the computer on.
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Press in and hold the D key while the pc is booting up.
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Different colors will appear on your screen.
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Once the self-test has completed, reboot and see if the problem is fixed.