Cinema Display Power Light Suddenly Not On & Power Button Not Responding

So, I've had major problems with my G5 which Apple diagnosed as being the board (and then the video card etc...). They gave me a $700 credit towards a new machine (I got a new MacBook Pro) but before I put the old G5 up for sale I wanted to try pulling some of the RAM to see if the problem was just faulty RAM. I pulled a gb from OWC I put in after purchasing the machine. Pressed power and I got the start-up chime which I haven't been able to get forever, AND the fans didn't go into turbo mode like it did before. BUT, my display which I had left plugged in for the last 6 months and whose power button has been continually lit up with the machine unplugged.......now won't light. What happened? Please HELP!!!

Happened to me last week and I did eveything possible to investigate if my power unit was broken, cable damaged, fuse blown etc.  In the end I simply reset the PRAM and as if by magic the Cinema Disply came back.  Touch wood it has been alright since.  http://support.apple.com/kb/HT1379?viewlocale=en_US

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