Graphics/Logic Board issue?

[Blackberryroid]

I need a diagnosis. The Apple store is far from my area, so I need to know if it's the logic board or not.

Do you think the issue is related to the logic board? This appears every once in a while.

Screenshots appear fine, built in diagnostics says it's fine, external monitor works perfectly.

 

[Blackberryroid]

When the black thing is removed, though, these two lines stay permanently.

 

[NutsNGum]

Hold on a minute...

How is anyone here supposed to know?

 

[Brian Y]

If it was a graphics card issue, a screenshot will normally display the artifacting, and the external display will suffer the same problem.

It's the LCD