Screen problems

Okay, guys, I've searched the internet far and wide and could not find a solution. At first, my phone screen would flicker sometimes to black in the middle of doing something. Now, it takes a few attempts to start up the screen normally. It either powers on, showing a black screen...

Hello all, I ordered this Lenovo y70-70 from Ebay and I've had it for a couple months already and it's had this problem for as long as I could remember. Basically the problem is that my screen literally flickers like crazy sometimes, usually when I switch to another page or something along the...