What does green and blue line above the average of the Finder?

Hi all!

I have a question about something I noticed recently: a blue and green line on the Finder in the Dock icon. He has been there for a week.

What's weird, is that it has nothing to do with my screen faulty because it disappears when I hide the Dock or use an app in full screen. I tried to restart my computer.

It is a picture of what it looks like to...

Could someone please help me find what it means and how to remove the line, please?

Thanks in advance!

Mac OS X 10.11.2

Intel Core i5 at 2.7 GHz

8 GB 1867 MHz DDR3

Hi, C.Lehua.

Please visit Apple support communities.

I understand that you see the colored on the Finder icon lines.  Let's start by a NVRAM reset, and then adjust the display resolution to see if there is no change.

How to reset the NVRAM on your Mac.

OS X El Capitan: set the resolution of your screen

See you soon

Tags: Mac OS & System Software

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