Apple Cinema Display 23" and no image

[redhatdude at bellsouth.net]

Hello
I got an Apple Cinema Display and when I hooked it up to the computer  
running Fedora Cora 4 it's only black. When I restart nothing  
happens, it looks as if the display goes into sleep mode right after  
boot up.
I've tried reconfiguring xfree86 remotely via ssh and still nothing  
shows on the screen, just black.
Anyone knows a solution to this problem?
EJ