Hi.
Your machine uses MS-7778 (JasmineR) motherboard and integrated graphics chip which allows you to conntect 2 monitors at the back using DVI-D and VGA connectors:
Figure 6: Back I/O panel

1 - USB 2.0: 2
2 - Optical S/PDIF-out port
3 - VGA
4 - DVI-D
5 - LAN
6 - USB 2.0: 2
7 - USB 3.0: 2
8 - Audio: Center/Subwoofer port (yellow orange)
9 - Audio: Rear Speaker Out port (black)
10 - Audio: Side Speaker Out port (gray)
11 - Audio: Line In port (light blue)
12 - Audio: Line Out port (lime)
13 - Audio: Microphone port (pink)
Source: http://h20564.www2.hp.com/hpsc/doc/public/display?docId=emr_na-c03769164-6
Regards.
BH***
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