Mac Pro doesn't see third monitor

Guys:
My Mac Pro doesn't see all three of the monitors that I have hooked up...what am I doing wrong?
I previously came to you for your expert advice about video cards...I went and upgraded my Radeon 4870 which was running two monitors (Eizo and NEC) to a ATI Radeon 5870 in order to run three monitors (my new Cintiq)
When the Cintiq was not hooked up yet, the Mac saw the Eizo and NEC. When I connected the Cintiq...the Cintiq and the NEC show up but not the Eizo.
I went and upgraded the video card so I could run all three monitors because I didn't want to plug and unplug the Cintiq whenever I needed it. I believe I did my due diligence as far as research was concerned to ensure this would all work together...I'll be pretty bummed if this configuration can't do three monitors not to mention the financial cost.
Any help would be appreciated...as always.
Thanks!

I read your links, if I understand correctly, it may work with Dual Link DVI adapters?
My monitor connections are:
Eizo: DVI with the cord that came with the monitor (unsure if DVI single or dual link)
NEC: VGA to mini display
Cintiq: DVI to mini display (think it is a single link DVI)
Thanks!...so what do I need to go buy?
Here's a partial answer (need more info to answer about single vs. dual link, more about that later).
In the Mac Pro (Mid 2010)... document I referenced above there's a key note:
Note: The Apple Mini DisplayPort to Dual-Link DVI adaptor and Apple Mini DisplayPort to VGA adaptor are considered active adaptors.
So if you get the apple mini-displayport to VGA adaptor that will count as one of the active adaptors. I use one of those incidentially but I am not sure but it may be that all mini-displayport to VGA adaptors are consider "active".
Now for the single vs. dual link DVI question. It depends on the max resolution of those monitors (or the max you want to run them at). Single link DVI has a max resolution of 1920 x 1200, while dual link DVI can display a resolution of 2560 x 1600. So that's why I cannot answer this part of your question (you didn't specify the max resolution). If you only need single link active adaptors they will certainly be a lot cheaper than dual link.
Also note, you should only need two active adaptors on the card to support 3 monitors. So only one of the remaining connections needs to be an active adaptor. The other can be passive (much cheaper).

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