If the screen is black, then with computer on, shine a strong flashlight on the screen at about a 20 degree angle (90 degrees would be pointing the light right at the screen). Move it around to see if any of the expected graphics (e. g., login request) are visible. If so, your backlight is not working, but everything else is fine. A backlight failure is usually due to a dead fluorescent tube, but sometimes is the result of a bad inverter. If you have an LED backlight, check the LED driver circuit first.
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