23" Cinema Display not working.  Please help!!!!

I recently purchased a dual 2gHz MacPro Tower and a 23" HD cinema display (both factory refurbished by Apple). Everything worked flawlessly. Then...
I was away from my computer for about a week, during which time both the computer and the monitor were powered down the entire time.
Now my CPU boots fine, and I can hear it responding (when I raise and lower the volume, etc.) but the ACD won't fire up at all. The light on the front isn't blinking or anything, and I'm just wondering if there's anything I can do (I've already reset pram, replugged everything in, restarted several times, etc).
I've also done the ULTRA obvious stuff like brightening my display (which does nothing). I don't know how a less-than-a-month factory refurb that's been off for a week could go kaflooey, but any advice is greatly appreciated.

I'm having a similar problem although it may be USB related. It started with my 2 year old 23" display not waking up when it and the computer (3 month old 15" Mac Book Pro) were asleep overnight. The first two nights this happened I'd restart everything and it'd all be fine. The next couple nights I noticed that if I just unplugged the USB cable from the display into the computer, it would all wake up and function just fine. Today (the 4th day or so, and the day I finally have time to research what the problem might be) the display won't start up at all. There is no indicator light (and never has been in these situations) on the ACD. According to my Display menu bar and my system profiler, my computer definitely recognizes that the monitor is attached (although this was not true the first time the ACD acted up). My mouse also acts as thought the ACD is online... I have now adjusted brightness, and unplugged absolutely everything and replugged it all into a different power source. Still no go... Haven't had a chance to buy a new brick, not really sure that'd work for me... any ideas?
If it were the brick- based on what I've seen on the back of my ACD, it doesn't even look like you can disconnect the cord?
and just a side note... in exploring this problem i noticed that you can choose what the power buttom on the ACD actually controls in the Options menu of the Display System Preferences... is this only for older OS's? because my display preferences has absolutely no Options menu in it...
Thanks.

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