Colored stripes on my screen

Problem with Mavericks. Various colored stripes on my screen. They disappear after a restart but they come back after some hours.

This sounds like an issue with your display. The next time they appear, take a screenshot. If they do not appear appear on your screenshot, it is display related. If they do appear on your screenshot, it is related to your graphics processor. I highly suspected the former. Both are hardware issues and both are pricey fixes out of warranty, but a faulty display is cheaper to fix than a faulty logicboard. Best of luck.

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