Connecting external monitor

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I am trying to connect an external monitor to my iMac. The external monitor is a few years old and has a VGA which goes into a DVI which then went into my old PC. I bought a mini DIsplayPort to DVI adapter which i have connected to the thunderbolt port on my iMac. The external display does not appear on my iMac and my external monitor displays nothing either. My monitor says VGA: No input when it is switched on, but all the cables are connected.
 
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bobtomay

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If the port on your monitor is VGA, then you'll need a mini displayport to VGA adapter like this.
 
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Looks like i will have to go and buy another adapter then, thanks for the help.
 

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