I recently had a Lenovo that made me wanna tear my hair out. Bad hinge on the screen assy, I move the screen and everything to the new back cover. The way it's designed is if you don't route the cable on the correct side of the hinge it will rip the display cable out and short all of the pins.

I thought I was finished after I closed it and when I opened it the backlight was dead, great, now I need another screen. New screen comes in and dead backlight again, turns out it's a bad MOTHERBOARD. I even tested for it before ordering the screen, the motherboard worked normally and runs on an external display. So now I would have bought a new back cover, screen and motherboard. My boss just decided to buy the guy a new laptop because of the nightmare this thing has become, sucks cause it's a loaded expensive 10th Gen Intel i7 and we obviously have to comp him with an equivalent laptop.

Sometimes people don't realize how hard this stuff is and why it's so expensive. Not to mention apple will perforate their cables (just like in notebooks so the paper tears cleanly) to make the cables rip when repairing them.