Why is my 24-inch LED display flashing black (and sometimes scrambles) every few seconds?

I have recently upgraded to a new iMac: 3.4 GHz Intel Core i7. 4 GB 1333 MHz DDr3. AMD Radeon HD 6970M. 1024 MB. Mac OS X Lion 10.7.4. I have it attached to a 24-inch Cinema Display.
Before I switched to my new iMac, it would blink black a couple of times a day. This was going on for a LONG time, but was not a big deal. However, now that I have switched to the new iMac, it is every few seconds. And it has now added the "scrambled" screen to it's repertoire. Fun. And, as I am typing this...it just went black and has not come back on.
I've read a few threads on this happening, but haven't found any substantial evidence as to what is causing this. It's beyond annoying. Has anyone learned anything new?

Okay. Murphy's Law. As soon as I posted this, I found an answer (hopefully!). My situation fit the criteria at http://support.apple.com/kb/TS4045?viewlocale=en_US and I installed the update and so far, so good. I'll keep you posted.

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