Answer to: What is causing the display to glitch outYou'd better get a monitor to connect your laptop to confirm if it's LCD's problem or GPU or graphic memory's. BTY, has your laptop been repaired before?
Answer to: Why when I turn on my computer a black screen...First of all, you should figure out if the laptop have been broken. You'd better get a matching adapter to try to tune it on. Then if it can be work, congrats- you just need to buy a new matching adapter. If It can't be, the laptop might be broken.