Re: Screen issue
Looks like you're having an issue with the actual screen. Either a loose cable inside the phone or the panel itself is failing (or has failed). Being that it's a perfectly straight line, it doesn't appear to be the result of cracking, but it could still be an internal failure as the result of a drop.
And.. welcome to AC, and congrats on figuring out that you need to register to post a screenshot (and HOW to post the screenshot), so many haven't done the same even when we needed to see it!