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Mac Pro :: Unable To Use Dual Monitors / No Signal On Both DVI Channels


After lots and lots of reading I went for flashed Sapphire 4870 512 off eBay for my Mac Pro 1,1 running SL 10.6.2, with two Viewsonic VP2030b. The guy selling the card had sold flashed cards before and had 100% feedback, said the card worked with dual monitors and supported SL. Got the card, installed it without a problem, but could not get it to work with both monitors.

Second monitor said no signal on both DVI channels. Checked all the wires, reinstalled, rebooted, no luck. Plugged both into my 7300GT, no issues at all. At one point, I got the left monitor to boot as the extended desktop, showing the dock but not showing the HDD or icons (which should be on the right screen), but the right screen still showed no signal and was black. Used the gather windows botton in the display preferences to see if adjusting settings helped, still nothing. Detect displays button was no help either. Is this a compatibility problem on my end or a flashing problem on his? Contacted him and he said he had no issues with his MP 1,1 and two 20" Apple displays.


View 1 Replies (Posted: Jan 10, 2009)

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I just hooked up a 2nd monitor to my early '08 Mac Pro and when in OSX the screens start to go blank/blue for about 1 second intervals. They flash together sometimes, and other times sort of independantly to each other. When the desktop comes back on it fades in like its animated rather than like its cutting in and out.

It seems fine when I disconnect one monitor.Running 10.5.2 all updates 8 core 2.8ghz with 10gb ram and 8800GT

Posted: May 15, 2008

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Mac Pro :: Updating To 10.6.3 - Now Dual Monitors Don't Work?
I have a Mac Pro 1,1 with a flashed ATI Radeon HD 4870 XFX. Had no problems with it ever.

Installed Mac OS X 10.6.3 software update and now the second monitor says No Input detected. Switched second monitor to first monitor and it worked fine, but the second DVI port no longer works.

Need to get this figured ASAP as I have a lot of work to do today... very unhappy with this update. Anyone else having a similar issue or have any thoughts on what to try? I've done everything I can think of.

Do I need to flash it again? Seems silly to have to flash it every time you update the OS. The video card is still recognized in System Profiler. HD 4870 with 1GB GDDDR5 VRAM.

Posted: Mar 29, 2010

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Mac Pro :: Dual Monitors - Separate Screen Saver Settings
I've got dual monitors up and running for the first time. With my workflow, I'll be working at one monitor for several hours and then the other for several hours. I'd like to have independent screen savers for each monitor so the one not being used won't get burn in, etc., but I don't see any way to do that.  

Perhaps I'm answering my own question here, but I would suppose that if I'm in extended mode (which I'll be doing) it's really just one big screen, so there isn't a way to tell the other screen to start running a screen saver....and if I'm mirroring, they're both doing exactly the same thing. Those pieces of logic tell me that I can't do what I want to do.  

Posted: May 8, 2012

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