About my screen display blackout

[YOSEPH EDEMA]

2 weeks ago while shutting down my pc i accidentally click on update and shutdown option then when it takes too long i shut it down by pressing and holding on power button (force shutdown). On next day when i try to open my laptop the screen display ( monitor ) was black, nothing was showing even there was no light. So i started using my laptop by connecting with TV using HDMI cable but still the screen to display on the TV it takes at least 20 minutes, it doesn’t show as soon as i plugged in. I asked one of my friends about this and he said maybe the display cable is broken or display graphic

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