White line screen sometimes?

[Dirtyharrydev]

Hi guys,
I have a little problem, I did buy a Macbook Air mid 2013 11 inch CTO 8GB of ram for like 2 months ago.
I have only used Mavericks on it so I don't know if it's Mavericks or HW problem.
I did update from ML to Mavericks.

Some times like when I open a folder from the dock, I use "Grind" as view option.
I can get a little white line at the screen, the line do pop-up at the place there the folder shows but it disappear right away.
It's not on the hardware it looks like that the line is in the software / Video.

I did test Apples HW Diagnostic and it do not show any kind of error codes so I guess that it's not a HW problem?

Can it bee because of that I did update from ML to Mavericks and that I did not do a clean install? Or is it simply a bug in Mavericks?

I know that I can install ML and try, but the recover partion is Mavericks and it 'll take time to re-install ML so I wanted to ask you first.

So what do you think?


Edit: I have tried PRAM reset now, option+cmd+p+r in startup.
But still I'm wondering what you think, is it a HW error?
And I don't know if it did fix the problem or not.

 

[nyolc8]

if the line is on a screenshot too, then it's 99.99999% software problem.

 

[Dirtyharrydev]

The line is not all over the screen, it's just on the spot where the grind from the folder was.

It popups the. Disappers when the folder goes down.

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if the line is on a screenshot too, then it's 99.99999% software problem.

Ok, but it goes so fast so I never gets the chance to take a screenshot.

It have happend 3-5 times in two month so.

Is cmd+shift+3 for the hole screen right?

 

[w0lf]

Is cmd+shift+3 for the whole screen right?

Yes it is.

 

[Dirtyharrydev]

I have downgraded to ML, pram and smc reset and now It seems that the problem is gone.

I guess that it was a bugg

 

[Dirtyharrydev]

Insted of white line the screen are lagging some times in ml.

According to console it's something with the dock img thing.

So yes its a bugg

 

[mynameis321]

I'm having this problem with my 2 day fresh out the box 2013 13" Air, I've just noticed it when I swipe from a full screen app to the left. I don't know what grind is, and i'm not on Mavericks

Is this a hardware fault?