I have the same diaplay on my laptop and it works cine BTW its also a Compaq.
To find out if it will work dual diaplay use an s-video cable, and hook it up to a tv put the tv on that video input, then power up the computer.
set the properties on the diaplay for the second display, and select extended desktop.
Don't expect to have a sharp picture on the tv, it only has to display graphics, and will look fine. If you do get the dual display, you will have the desktop icons on one display, and only a blank desktop on the second (tv) display. This indicates that the display is working and all is fine.
