Why does my MacBook screen keep going dark?

Hi, my new two weeks old... its the new silver 13 inch Macbook's screen keeps dimming slightly. I'm charging it, I'm using it, it's not like it's going into sleep mode. I don't understand why this is happening.

And I'm having problems with the mouse. Sometime it won't register that I've clicked. Or it won't move the curser even though I'm pressing the mouse.

Any suggestions or should I take it back to the store?

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