Suddenly screen becomes blank

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Hello,
i am using my HP note book with windows 7 ultimate , using my notebook for some more hours ,suddenly screen becomes blank and no keeps are working but power button is on .there after power off the power button then again power on the button it is working . i need the solution for why screen becomes blank after some time .please help me if any one know the answer


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We normally associate this type of problem with heat buildup within the computer. Is is possible to blow out the dust?
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thank you very much. might the be problem .it will observe on the heat buildup .so what i do ? will i change the which component in the laptop .please suggest me
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you can try using canned air to blow out the dust. I do not suggest changing any parts.
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thank you .i will do what you said hope so might be working is good .
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hi xpcman , you were suggested me canned air to blow out the dust .it means shall i clean the inside dust of laptop .is it sufficient to solving the problem because again my notebook getting the same problem .could you please suggest me .still now i was not clean the inside dust .please guide me