Weird blue horizontal lines occasionally on the screen?

MinecraftKid45

Reputable
Jul 19, 2015
30
1
4,540
So, last night I was looking inside my laptop, just cleaning it out, and I took my hard drive out, got my dust can and blew under the motherboard, and put it back in.
Put my hard drive back in and put it together.
When I turned it back on and logged back in, I saw that some things were corrupt and I needed to run a ChkDsk (Check Disk), so I did, and now everything appears to be fine, other than these annoying blue lines that pop up on the screen.

I am going to re-install the driver for my GPU (Intel HD Graphics) and see what that does, I use an external monitor, therefore, I am going to test it, too. And see if it might be the monitor cable.

What do you guys think I should do? Thanks!