RE: Inspiron 15 7000 gaming has grey vertical lines after opening the lid
I found a fix that worked for me for this issue after trying to update BIOS and everything else didn't resolve the problem. In short, rolling back one of my video drivers to an older version got rid of the problem for me.
Specifically, what I did was go into "Device Manager" -> "Display adapters", and then right clicked "Intel(R) HD Graphics 630", clicked "update drivers", then "browse my computer for driver software". I then chose an older version of the video driver and installed that. I'm posting this now that I've finally opened my lid without seeing that annoying screen and having to power off.