DisplayPort Connection on MacPro with HD 4870

I just bought an NEC PA271W monitor which can utilize both a DisplayPort and DVI connection. It came with the DVI cord and worked great with my early 2009 Mac Pro.
I wanted to use DisplayPort, since the color depth is higher when using DisplayPort on this monitor.
I connected the display with the a MiniDisplayPort to DisplayPort cable from my HD 4870 graphics card to the NEC. It worked great... until...
I tried shutting off the monitor. When I powered it up, it couldn't "see" a connection via the DisplayPort port. I'd have to disconnect the cord and re-insert it to "wake" it up. This obviously isn't the real solution.
For now, I've gone back to the DVI cable, but was wondering if others have had similar issues? I've tried resetting the Mac's PRAM. I've also reproduced this more than once, even after the NEC goes into its own sleep mode. After it is turned off or goes to sleep, the monitor fails to display anything until the cord is physically removed and re-inserted.

Malcolm Rayfield wrote:
I wanted to use DisplayPort, since the color depth is higher when using DisplayPort on this monitor.
DisplayPort may be able to handle extra color depth, but I don't think it's supported by OSX.
John Hendron wrote:
Not supported by OS X? Then why does Apple put MiniDisplayPort connections on all their machines now??? I don't think that's correct.
This is a tricky area, where one must pay attention to more than just what one spec says.
DisplayPort is capable of carrying a 10-bit signal. But for that to work on your monitor, ALL of the following must support 10-bit color:
a. The monitor, I guess you got that
b. The video card, I read that the 4870 supports that in this article
c. The video card driver for OS X
d. The OS itself, again the linked article indicates that Snow Leopard can go above 8 bit for video
e. The app you're displaying from, this is very rare these days as far as I know
Point being, even if OS X supports it, +every other+ link in your chain had better, too, or you're not gonna get it. If the monitor has a 10-bit lookup table, as the article says you can still get a general benefit by using high-end third-party calibration in OS X to adjust it inside the monitor.
If we cannot answer your question here, you might ask this guy who wrote an article about your exact monitor on a Mac Pro, because he loves the monitor. One would guess that he has a 4870 lying around in that lab of his.

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Here's a review on the NEC displays.
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Message was edited by: MisterHugh

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