Black Horizontal Line in Top Left Corner.

My mac started showing this line at the top left corner of the screen. I use 2 monitors and this was on my MacBook display. If anyone has any idea how to fix it or can tell me what causes it for future reference that would be great.
Here is a SCREENCAP.

Same here. Can't figure this one out. Perhaps its a graphic glitch? Does someone at Apple have an idea??

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Hi,
How to put cross line over top left corner in cheque (cross cheque) while doing it through SAP SCRIPT.
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Hi,
i can give you two solutions. try the thing which looks fine for you.
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so try the second way.
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My MacBook Pro just turned itself off while installing Windows 7. It has now got a black screen with a white flashing bar in the top left corner...what can I do?

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11 July 2010
My computer bought 7 March 2009.
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Hello
It seems that something has muddled up your Windows installation and so the computer cant boot anymore.
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Hi
I've recently notice I have a thin black line in my screen.. I went to Apple store and was told it’s a hardware problem (400$+ to fix as no warranty).
This is the second time I’m having hardware screen issues with a Macbook Air (last time it was 3 months after I bought it, and it was replaced with this one)
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Open Office (Office 2007-like suite compatible with OS X.)
NeoOffice (similar to Open Office.)
LibreOffice (a new direction for the Open Office suite.)

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So here it goes
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or
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Black Horizontal Line in Top Left Corner.

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