Why does my monitor go blank when I try to use extended desktop?

agabelman

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Aug 8, 2015
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I am running Windows 7 on an HP G62 laptop. When I try to use extended desktop with my Dell monitor, the monitor screen goes blank after a few seconds. When I shut off the monitor then turn it back on, the monitor again works for a few seconds but then the screen again goes blank. Can anyone help?
 

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