23" Cinema HD Display-Turns on, recognised by Macbook Pro but no picture

I have a 23" Cinema HD Display. It turns on, my Macbook Pro can see it in the Displays panel but there is no picture.
*Any thoughts / ideas on how to get it working again?*
- The power light does not flash any diagnostic pattern.
- If I shine a torch to the display I can't see anything, even faintly.

I just posted a question about a similar problem. In my case I believe the cause of the problem is the Cinema HD Display 90w Power Adapter (a.k.a. the power brick). I was fortunate to test this out because we have several identical displays in my office.
My problem now is locating a new power adapter for the display. Apple doesn't seem to sell them online as a separate unit, as far as I can tell. I'm heading down to the local Apple Store next…

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