How can I know if a Cinema Display 22 inch ADC is dead ?

Hi,
I bought a 22 inch ADC Cinema Display for my PowerMac G4/400 (Gigabit Ethernet). I upgraded the PowerMac with an ATI Radeon 7500 graphic card and a Sonnet 1Ghz processor. I'm running 10.4.9 and have the latest ATI driver for the card.
When I plugged the ADC cable, the computer started but the display didn't light up. All lights are off and the USB ports are not powered. If I unplug he PowerMac, plug the display and plug the PowerMac back, I can't start it using the power button (on the display neither).
I checked and rechecked my PowerMac and Cinema display specs and requirements and everything should be compatible. Is my Cinema Display dead ? How can I know for sure ? Are there any drivers I must install ?

I'm having a similar problem, only it's recurring on several Cinema Display monitors on different machines.
One thing we have been able to figure out is that the problem appears to be the power brick. By repeatedly unplugging and wiggling the power cord at the brick, the monitor will eventually come back on... until you restart it.
This is VERY frustrating for such expensive monitors (not to mention being Apple products). I suspect the problem lies with faulty power bricks, and I'll be following up with Applecare to see what they have to say about it.
- Alex Locke
PowerMac G5 Dual Processor   Mac OS X (10.4.5)  

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