LIGHTS ON BUT LAPTOP OFF !!! [Closed]

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Wednesday August 17, 2016
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Monday February 1, 2010
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Hello! I have a hp laptop probook6550b.It had been never done a problem.It was working very well a few days before .But now when i on it its lights r on but a blackscreen come and nothing happens next.Plz help me my important files r in my laptop.Is it a ram problem??

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48727
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Monday February 1, 2010
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September 19, 2020
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Try this

1. Remove the battery and cable.

2. Press and hold the power button for 58 seconds.

3. Replug and start.

Good luck