Black screen but still running

[a.anand5]

Hi guys,I left my laptop on for a while as I had to do something and when I came back the power was on, the fan was running, and the keyboard backlight was on, but the screen was black. I tried moving the mouse and pressing keys but it didn't wake. I also tried Windows + Ctrl + Shift + B and Ctrl + Alt + Delete but still nothing. I tried closing the lid and opening it after 30 seconds but still nothing.The only way I woke it was by force shutting down using the power button and booting the computer. But then I am faced with "Windows didn't load properly" and so I press restart and then it work

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