Just got iMac 21.5 can't get image on Apple Cinema HD display - is it thunderbolt issue?

I just got my new iMac 21.5" desktop and tried to connect my 21" Apple cinema HD display. I have power to the external display but no image - screen blank. I'm wondering if it is a cable issue even though the adapter I used to connect this monitor to my MacBook Pro fit the thunderbolt port - is this a port or adapter issue?

In continuing my research on this topic, I found this article:
http://support.apple.com/kb/TS5198
Short version, the 23" Cinema HD is among one of several older "vintage" Apple displays that are no longer supported under Mavericks. No brightness control, and it's likely to not work reliably at all. I can't say why I was able to use it for as long as I did with no problems. I take all this to mean that the display itself works fine, but not with my new MBP Retina.
Though a tempting excuse to spend another grand on a 27" Apple Thunderbolt display, I opted for a $250 HDMI monitor from Fry's instead.

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