The screen goes black and then instantly comes back on

While I am using this brand new computer, the screen flashes to black and then instantly comes back on.
Any ideas?
Mary C.

Thanks for your help. I think the problem was that I was new to using a mac. I was accidently moving the mouse to the top left corner and that sent the screen to a screen saver, but then I would instantly move the mouse away and that would bring back my desktop.
My mac also gets hot in the middle at the back and then a fan comes on to cool it down. It is a nice quiet fan so that is good. The heat feels good on my legs and actually keeps me warm. What a nice mac that keeps me warm! The other night the electricity went out in my hotel room during a big storm and the strobe light on the front of my mac served as a nice night light and flash light to get around the room. I love my mac!
Mary C
MacBook Pro Mac OS X (10.4.8) other uses for a mac

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From the news page here...
http://xlr8yourmac.com/
See if it's related to this...
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http://www.xlr8yourmac.com/archives/feb13/022813.html#2012macswontwake
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http://forums.macrumors.com/showthread.php?t=1529750
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