Weird graphics issues...

You can try taking it to apple for diagnosis, but if it has not happened again in any form I would not be too worried. If it happens again, take it in.

 

I'm guessing graphics card. In your case the CPU maybe. Graphical artifacts could also be bad memory. I would take it in for sure and get it looked at.

 

The 13" MBP does not have a discrete GPU. The Arrandale GPU is on the CPU chip. Also, it uses system RAM. This looks like a hardware fault, but the only way to be sure is to take it to Apple. You may end up with a new logic board.

They won't worry about the hard drive as it's user upgradeable, however, if they replace the drive or the whole MBP for some reason, you'll end up with an OEM drive in place of yours.

 

Isn't it a software problem since it shows up on a screenshot?

 

I don't know. I know for PC's it wouldn't be a problem as the techs know hard drive has nothing to do with video.

You could always say it came with the laptop when you bought it. Play dumb.

I'm not familiar with apples warranty so I can't really answer it

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I'm guessing he took it with a camera.

I've seen this before with PC's and it's usually either video RAM (or RAM if the video card uses shared system RAM) or video card. Also even the display itself could be a problem.

You can easily tell if it's the display if you hook it up to a external monitor, clone the display, watch both displays and see if it happens on both or not.

 

I've seen this a few times before. It happened to my 2010 mbp but I never really figured it out. It seemed to only happen on intel graphics.