My Nintendo ds top screen flashes?

Well I got my ds in december so I have had it for about 6 months, and I am very careful with it. But my top screen has been flashing and I don't know what to do. Do I need to replace it or what?

And if there is no way to fix it, or if it is going to cost a lot of money, then what game system do you recommend me getting in the future, I mean the one that last longest, you know xbox, wii, playstation, or dsi, or any other game system? Thanks in advance.
 
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