MacPro3,1 + Radeon HD 5870 + NEC PA271W-BK + DisplayPort

Hello all,
As metioned in the subject line, I have the following system configuration:
2008 Mac Pro ( MacPro3,1 ) : 2 x 3.2 Ghz Quad core
ATI Radeon HD 5870
2 NEC PA271W-BK Displays
As many of you know, this ATI video card has 1 DVI-D out and 2 MDP outs. So, if you want to connect more than one display, you must use a MDP connector on the video card, or install another video card.
I wanted to use this video card and connect to these NEC displays so that when it becomes supported in software ( I'm aware of the limited support in Photoshop CS5 ), I will have the capability of displaying 10 bpp output on my monitors. Because of this, installing another video card, or using a MDP to DVI-D adapter of some variety is not an option.
I have one display connected via DVI-D, and the other connected via a MDP to DP cable I bought from Monoprice.com. With this configuration, I had the following issues:
- With display plugged in to MDP, machine would not boot. No startup sound would be played, but the hard drives would spin up.
- With display plugged in to MDP, machine would not wake from sleep. Hard drives would appear to spin up, but no image would be displayed on the monitor.
I found that if I unplugged my MDP monitor, booted the machine ( or woke it from sleep ), and waited for the login screen to be displayed, then I could plug in the MDP monitor and it would work. So what did I do? I crawled underneath my desk every morning, unplugged the MDP cable, woke my machine up, and then plugged the MDP cable back in. I did this for a month.
Apple support said that they couldn't help me, because the Radeon HD 5870 is not officially supported on MacPro3,1; it's only supported on MacPro4,1 and newer.
Of course, I searched extensively on the internet for a solution, and there were some that seemed to work and others that didn't. NEC also published a document that said that these errors occurred with certain types of aftermarket MDP to DP cables, but the one they recommended, the Monoprice.com MDP to DP 6 foot, was the one that I had!
Here are two Apple support discussions on the subject which have been archived:
https://discussions.apple.com/thread/2587838?start=0&tstart=0
https://discussions.apple.com/thread/2583903?threadID=2583903
On a whim today, I went to Fry's and bought a new MDP to DP cable, based on a hunch that my issues may be related to a faulty cable.
It totally was the cable, and my setup works with no problems after I swapped the old cable out.
I wanted to share my solution with others as this can be frustrating. The cable I bought was a Monster Cable Digital Life 8 foot MDP to DP cable. Normally I think that Monster Cables are a complete waste of money ( this one was almost $100 with tax ), and this is NOT a plug for Monster Cables, but with this configuration and the Monster MDP to DP cable I was able to get everything to work.
Hope this helps for anyone who is out there banging their head against a wall.
-n

nedwilson-
The DVI port on your card is a Dual-Link DVI-I, which is suitable for higher than 1920 wide, and also contains the VGA signals directly in the bar and four surrounding pins at one end of the DVI connector.
A great deal has been learned since you reported your first problem some months ago.
ATI has made a list of approved adapters available:
http://support.amd.com/us/eyefinity/Pages/eyefinity-dongles.aspx
DisplayPort, and its Mini variant, are not just a different-shaped DVI port. They are a completely different protocol with a packet interface.
Some early DisplayPort adapters simply do not work:
TS3533- Apple computers: Black screen or unresponsive Mini DisplayPort display after sleep

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      ID fornitore:    0x1002
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      ID fornitore sottosistema:    0x106b
      ID sottosistema:    0x00d0
      ID revisione:    0x0000
      Ampiezza link:    x16
      Velocità collegamento:    5.0 GT/s
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      ID fornitore:    0x1002
      ID dispositivo:    0xaa50
      ID fornitore sottosistema:    0x106b
      ID sottosistema:    0xaa50
      ID revisione:    0x0000
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