Dual monitor trouble/video trouble

I have a 2010-version Mac Pro (model 5,1) (purchased early 2012) with the stock 5770 video card running identical HP LP2275W monitors by the Displayport connectors.
No recent changes in hardware, OS or software.
Suddenly, the "secondary" monitor is going black, going to sleep and then waking up every few minute or so. When it goes black, all icons and such move to the left monitor just as if I only had a single monitor system, then return to the secondary monitor when it comes back on by itself.
I've jiggled video cables, run Tech Tool Pro, did some dusting in the Mac Pro and so on but no cure.
1. Video card going bad?
2. Could I use the DVI connector on the card to see if the second monitor works properly or do I have to use both DP cables for two monitors to work?
3. Motherboard issue?
4. Genius Bar appointment this week?
Thanks for any suggestions!
KWO

Illaass, thanks for the prompt reply!
I changed the second monitor to DVI with an old cable I had laying around and the issue seems resolved (nothing for the past 45 minutes, at least). That could still be either be a bad Displayport cable or intrinsic problem with the video card.
Any idea how likely it is that only one port on a video card would go bad? I'm tempted to look for another/backup video card since I'm planning to keep this computer for another few years, if possible.
KWO

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Last edited by mapintar (2012-04-04 15:12:44)

supermihi wrote:I am experiencing similar problems: Since yesterday's xf86-video-intel upgrade, the display manager does not start if an external monitor is connected. However in my case I don't even get to see a login screen, the X server crashes immediately.
I have tried installing xf86-input-evdev-git from AUR after I found your launchpad link, but unfortunatelly this didn't help. Have you solved the problem yet?
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Message was edited by: Samsara

Dual monitor trouble/video trouble

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