![]() If the computer doesn't pass POST (power-on self-test), it won't turn on or be responsive, and your monitor remains black. ![]() Once the computer is off, wait a few seconds and then turn the computer back on by pressing the power button. You can tell a computer is off when it has no lights and the fans are not spinning. To reboot a computer when you cannot see anything, press and hold the power button until the computer turns off. If the computer was on when the screen went black, something may have happened that requires the computer to be reboot.
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