Second display from iMac27" (late 2009) miniDisplay Port worked fine until today- now no longer connects to Apple Cinema Display

Have a configuration of an iMac27" (MAC 27"/4850-512MB PROCESSOR 2.66GHZ QUAD-CORE INTEL CORE I5 Dec 2009 model) and a second screen Apple Cinema Display 2009 model 24"
The setup with the Apple Cinema Display has been working fine for 3 years and since yesterday the second screen refuses to work.
Connected it to a MacBookPro and the Apple Cinema DIsplay functions fine sot my conclusion is it is not the Apple Cinema Display's error.
Could it be that the Mini Display Port on the iMac is somehow broken? Or is there a software fix I need to checkout?
Thanks for your help on resolving this issue.

UPDATE:
As noted in the first post, both of these newer USB DAC work fine at 24/96 on my wife's iMac, so it's clear that they didn't both become defective when I connected them to the Macbook Pro at the same time.
Resetting the Macbook Pro PRAM didn't help, so I removed the hard shell laptop case to get to the battery and remove it, then reset the SMC. After that I could use the original DAC at 24/96 again, but only IF it was plugged into the rear USB port. If I plugged it into the front USB port then the sound was garbled and filled with noise. This was a vast improvement over no sound at all.
Then I switched to the replacement/updated DAC, but I got no sound at all from either USB port at any bit-rate. And returning to the original DAC again now results in no sound again.
Sigh... I will reset the PRAM and SMC again, and see how far I can get with this. I'd still love some help. Thanks!

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