Q: My screen is flickering.

     I not even an hour ago had a completely different problem with my Mac fixed on here.

     My issue was solved by rebooting my Mac in safe mode. I was instructed to Shut down my Mac > wait ten seconds > power on > wait for the power on tone > then hold down the shift key > and let go when the Apple icon appeared.

     It solved the problem I had before but now my screen violently flickers when I go on certain websites. Not here for instance, no matter how fast I scroll. It does flicker on sights such as Youtube and Facebook, even with minimal movement. It's a shuddery flickering, kinda boxy looking. Weirdly enough, my keyboard light is not working now.

     Does anyone know what's up? Thanks in advance.