You want to run 2 monitors, your video card has 2 outputs. Just forget about the onboard video.
For $5 you can get an entire 6 foot long cable that will connect your HDMI port to a DVI monitor.
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http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10231&cs_id=1023104&p_id=2404&seq=1&format=2
I of course prefer the real cable with VGA on one end and DVI on the other (only if your monitor has a removable cord with a VGA port)
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http://www.monoprice.com/products/product.asp?c_id=102&cp_id=10209&cs_id=1020905&p_id=600&seq=1&format=2
By the way, HDMI is a digital only format, you cannot get VGA from the HDMI port. DVI is a combined spec, DVI-I is Analog or Digital, and DVI-D is Digital only.
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http://www.interfacebus.com/Design_Connector_Digital_Visual_Interface_DVI_Bus.html
QUOTE
The DVI-I connector may be used with a VGA connector by way of an adapter, while the DVI-D [Digital only] is not compatible.
(when are they going to fix the freaking links on this forum?)