Can you identify this iMac displayport and adapter?

i'm trying allow imac dual screen monitor dvi input. i'm having trouble identifying port on imac necessary. thought "displayport" ended buying wrong adapter:

http://www.amazon.com/startech-dp2dvi2-display-adapter-converter/dp/b0035ps57c/ref=pd_cp_e_0

believe have 2008 imac (or perhaps 2007 refurb) , port more squarish adapter bought. here picture of port: http://cl.ly/fcaa

can tell me name of port and/or link displayport dvi adapter?

 

you need mini dvi dvi adapter:

quote

mini dvi

mini dvi digital common interface on later g4 12" powerbook, on intel imacs till 2009 , on white , black pre-unibody macbooks , on intel mac minis before changed design unibody.

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mini dvi adapters can bought online from:

mini dvi vga adapter apple
mini dvi video (composite , s-video) adapter apple
mini dvi dvi adapter apple

mini dvi vga adapter monoprice
mini dvi hdmi adapter monoprice
mini dvi dvi adapter monoprice
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also of interest: "mini dvi, , how capture it"
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click expand...

most common video interfaces on external computer displays , tvs

common video interfaces on macs , appropriate adapters connect other display devices

most common audio interfaces on external computer displays, tvs , mac​

 

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