Comment connecter un iMac (port mini displayport) avec un écran Thunderbolt ?

Bonsoir,
Je souhaiterais connecter mon écran Thunderbolt à mon iMac. Malheureusement mon iMac n'a pas de port Thunderbolt, mais il a un port mini Displayport.
Lorsque je connecte mon écran Thunderbolt à mon iMac avec le cable Thunderbolt intégré à l'écran, rien ne s'affiche.
Je vous demande donc de l'aide, pour choisir une connectique adaptée me permettant de connecter mon iMac avec l'écran Thunderbolt.
Merci de votre compréhension

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