You need to reinstall the drivers...I am not sure which model version you exactly have. But they are available on the website.
For example http://h10025.www1.hp.com/ewfrf/wc/softwareCategory?lc=en&dlc=en&cc=us&lang=en&product=3810250&
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I think the problem comes from inside the screen the connector becames looseles or just try re-installing the aplication for them
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