how do i get my mac pro to dislay on 3 screens
Depends.
What size?
What card do you have?
What version OS X?
Apple had an excellent article on how to. Now I get "-404"
https://support.apple.com/kb/HT427
ATI 5770 + 10.6.8 + req'd display adapters (depends on dual link DVI or not)
If you are using a 5x70 card then you should read these:
Mac Pro (Early 2009), Mac Pro (Mid 2010): Supported display configurations
The general gist of these articles is that you need two active adapters to run thee monitors on 5x70 cards.
If you use DVI monitors and any of them have resolutions less than 1920 x 1200 then you can use single link active adapters. The "AMD Eyefinity Validated Dongles" chart shows some active (and passive) adapters that are acceptable. For example of a single link DVI active adapter is the Accell B087B-006B. An example of a dual link DVI active adapter would be the one from monoprice.com if you need to connect monitors with a resolution greater than 1920 x 1200.
Here's a good explaination of what's going in here and why you need two active adapters on these cards:
1) You follow the rules for adapters referenced above very, very carefully.
2) You make sure any Mini DisplayPort adapters are pushed in until essentially ALL of the metal end is inside the jack.
3) It just works.
All the software and initial setup is already in there, ready for you to plug in the displays.
how do i get my mac pro to dislay on 3 screens
