1 Main Display, 2 Mirrored Displays

[cjsett]

We have a Mac Pro with 2 ATI Radeon HD 2600 XT 256MB graphics cards. This gives us a total of 4 DVI outputs. Our current setup is:

DVI Output 1: Dell 2408WFP 24" LCD display
DVI Output 2: NEC VT700 1024x768
DVI Output 3: NEC VT700 1024x768
DVI Output 4: None

Under System Preferences > Display Settings, we have the 2 projectors mirrored so that they display the same image. All of this works perfectly.

The problem is when using Keynote, we get the presenter view on our main monitor (correct) but we only get the slideshow to show up on one of our projectors.

Somehow the computer can mirror the two projectors fine, but Keynote cannot. Does anyone have experience with this? Is it impossible to accomplish what we are attempting to do?

Thanks,
Chris

[Arlin]

You could just forget about the second video card and use a DVI distribution amplifier to send output 2 to both projectors.
Like this one.

[mswebb]

An external distribution box would be my take as well.

Keynote takes over the second display output and disregards other settings.

EDIT: Another option would be to use a pass-through from one NEC to the other. Depends on whether or not you have pass-through capabilities. If the NEC have this then you simply connect one unit to the PC and the other unit directly to the first. A switcher box will give you more control over what does on screen and isn't particularly expensive but pass-through works for mirroring and only costs the cable.