Urgent help please. Can't get image on LED cinema display.

My husband has a traumatic brain injury. His existing monitor went kaput yesterday, & I've been trying desperately to set up a new LED cinema display with his Mac Pro that was purchased May 2007 for the past 4.5 hrs without success. Can't get any image on it & don't know what else to try. Any suggestions please?

Can we assume that the graphics card has been replaced with one that has a mini display port, such as the Radeon HD 5770 or the Geforce GT 120? The originally shipped graphics card options for the 2007 Mac Pro do NOT have the Mini Display Port.
Does my computer have a Mini DisplayPort connector?
If not, one will either need an Atlona AT-DP400 adapter to connect the LED Cinema Display to a dual link DVI port of the graphics card OR to replace the graphics card with one that is equipped with the Mini Display Port.
Review of the Atlona AT-DP400.
Also, does the Mac Pro have OS X 10.6.4 or later?

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