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Cant Extend Laptop screen

Last Modified: 2017-04-07
Using HP Elitebook 8400 G1 (Windows 7 x64 ) , it got build by wrong drivers,  means it got imaged with HP G3 drivers, I have installed the right drivers for this laptop but even then I am not able to extend my laptop screen to a monitor (Dell), I have installed a driver for this monitor as well, changed cables, changed monitors, but none of the monitors detects the laptop. I have uninstalled and reinstalled Display drivers as well, so far nothing has worked.

Anything I am missing?
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