27"Apple Cinema Display

system - MacPro

Software Mac OS X Lion 10.7.5 (11G63)

Graphics NVIDIA Quadro 4000 2048 MB

Memory 32 GB 1333 MHz DDR3 ECC

Processor 2 x 2.66 GHz 6-Core Intel Xeon

Displays 2 x Apple Cinema Displays 27"

I am having problem with one of the displays. Few min. after start up, it flickers and then shuts down.

This display is conected to ALTONA (Dual Link) DVI to Mini Display Port. The othe is conented to the display port.

I have also tried to conect this monitor directly to the mini display port on my MacBookPro, and it did the same thing, shuts down after a few flickers.

I have bought this just 1 year ago and the warrenty expired last month.

Please help.