Why my screen is keeping black screen when i leave the mac book with few hr

when i leave the mac book pro on a few hours, it kept black screen. i try to press any key and open button, it kept no response. after 3 mins, i press open button again. the mac book appear off. so i press the open button again , it open.
do i need to change a new mac book pro in this situation? because this is my new computer, i can change a new one within 10 days.
plz give me some suggestion, thank you!!!

In actual fact this seems a bigger problem than I thought. Linking the two computers via the Thundernolt cable and selecting cmd F2 no longer shares the screen at all and Apple say it may not be able too in Mointain Lion - What are they playing at, hundreds of customers link computers together and share the screens - Lets hope they are wrong and tell us what we need to do other than move back to Windows.

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