You'll need to get a DisplayPort cable Vs a Thunderbolt cable. Surprising even though they look the same they don't work the same!
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Your iMac has a mini DisplayPort not Thunderbolt so it can't power the cable which is needed for the headend circuitry located in the cables connector.
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Your iMac has a mini DisplayPort not Thunderbolt so it can't power the cable which is needed for the head-end circuitry located in the cables connector.
You'll need to get a DisplayPort cable Vs a Thunderbolt cable. Surprising even though they look the same they don't work the same!
Your iMac has a mini DisplayPort not Thunderbolt so it can't power the cable which is needed for the headend circuitry located in the cables connector.