White/black stripes on my screen for a few seconds on my Macbook Pro Retina

Hello,
Sometimes there appear on white/black stripes on my screen for a few seconds. There isn't a specific programm or anything when he does that. It comes and it goes. I don't know if it's serieus problem. Do somebody know what to do?
Thanks

Hi there,
I would recommend taking a look at the troublehsooting steps found in the article below.
Mac OS X: Gray screen appears during startup
http://support.apple.com/kb/ts2570
-Griff W.

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White/black stripes on my screen for a few seconds on my Macbook Pro Retina

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