Not Detecting second monitor on HP Pavilion p6-2100

I'm trying to set up dual monitors on my company's shipping computer but Windows won't detect the second monitor. Both monitors are connected using a VGA port, but the second monitor is connected to a DVI-D port via a an adaptor. Nothing has been added to the computer, I'm using the onboard video card for the connection and the latest driver has been installed.
Here are the specs:
HP Pavilion p6-2100
Windows 7 Home
AMD Radeon HD 6410D
Main monitor - HP 2311x
Second monitor - HP 2009m
Any help would be appreciated

GreenVista, welcome to the forum.
Here is a guide provided by HP to help you connect two monitors to one computer.
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