30" display doesn't always power up

I have a Mac Pro with a 30" Cinema Display. I have had trouble with the display powering up when I turn on my computer. I have hooked up another monitor and it works perfectly. The problem is with the Apple Cinema Display. I've taken the whole thing to the Apple Store and when they hooked it all up everything worked fine. I'm tired of having to turn everything off and reconnect the display to the computer until the Cinema comes on. I carefully follow the procedure in the display installation guide.
Once I get the display to come on, I don't turn off the computer. If I restart the computer the display works fine. It is only when the computer gets shut off that the display stops working.
Any suggestions as to what may be the source of this problem?

I am experiencing the exact same problem. I made the mistake of shutting down and now the usb and firewire ports at the back "don't work". If I connect the cables the monitor turns off. Now I have to connect my keyboard and mouse directly to the back of my mac as a work around. It is very frustrating and I would love a solution. I have a feeling it may be related to the power supply, but I can't afford to disconnect my mac long enough to sort this out at a service centre.

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