When i log off sometimes screen gets off or black.

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Tuesday February 26, 2013
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February 26, 2013
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Hello,
I had bought lenovo g580 model laptop last week dos based then i installeed windows 7 32 bit but i am facing a problem that when i log off my account sometimes the screen gets off or turned to black then when i press start button screen gets start again .what is it ?
resolve my problem ???
reply <email address removed> or here comments . please help !