So here's how it all went down...
This morning when I open the device manager, I saw that the display adapter, Intel HD Graphics 4000 had a yellow exclamation mark on it. When I clicked it, it saids Window had stopped the device from working(code 43). I fixed this problem yesterday with no trouble. I knew the cause of it because I was installing third party themes and somehow the display adapter got the yellow exclamation point.

But this morning was different, I decided to restart my computer when I see the yellow exclamation point thinking it would go away. Oh, I was so wrong. When I restarted, the computer boots up with "Lenovo" and the loading symbol. Then a black screen appears for about a minute then the mouse appears. After a few minutes, a grey screen started flickering everyone 3 seconds or so. When I try to move the mouse, it moves and went back to the center every time the grey screen flickers. I'm fairly positive that this is only the display adapter problems and every other hardwares are working fine and their drivers are up to date. I've search the internet but no problems was like mine, only black screen. The closest I found was graphic card getting uninstalled accidentally.

I've tried going to safe mode with F8 but Window 10 is a nutjob and I can't get anywhere. All there is on the monitor is black screen, then grey flickers. I tried my best to stay calm when fixing the problems, but I'm slowly going to panic mode.