Help: 2011 imac 27" won't detect External Display connected via thunderbolt to HDMI

I have an 2011 imac 27" and I'm trying to connect an Acer 23" monitor as an external display. I'm using a miniDV(thunderbolt) to hdmi cable. For some reason the computer is unable to detect the display. However when I reboot into windows via bootcamp, the display is detected and works perfectly.. Any way to force thunderbolt to detect this?

Well, weird outcome... I took the monitor back and exchanged it for a better model, better brand. The thunderbolt to hdmi cable works fine with this new monitor in osx. Thanks again..

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    Message was edited by: Tyke Tyler
    Message was edited by: Tyke Tyler

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