I'm having trouble using multiple displays on Mac Pro 2006 (OS X 10.6.8). System Preferences does not detect my projector. Suggestions?

When I enter System Preferences and select Displays, I am given a button to direct OS X to Detect Displays. But when I choose the button, nothing seems to happen. There are only two tabs visible--Display and Color--neither of which has anything to do with getting the software to recognize that a second cable has been

A female DE15 socket (videocard side).
Pin 1
RED
Red video
Pin 2
GREEN
Green video
Pin 3
BLUE
Blue video
Pin 4
ID2/RES
formerly Monitor ID bit 2, reserved since E-DDC
Pin 5
GND
Ground (HSync)
Pin 6
RED_RTN
Red return
Pin 7
GREEN_RTN
Green return
Pin 8
BLUE_RTN
Blue return
Pin 9
KEY/PWR
formerly key, now +5V DC
Pin 10
GND
Ground (VSync, DDC)
Pin 11
ID0/RES
formerly Monitor ID bit 0, reserved since E-DDC
Pin 12
ID1/SDA
formerly Monitor ID bit 1, I²C data since DDC2
Pin 13
HSync
Horizontal sync
Pin 14
VSync
Vertical sync
Pin 15
ID3/SCL
formerly Monitor ID bit 3, I²C clock since DDC2
The image and table detail the 15-pin VESA DDC2/E-DDC connector; the diagram’s pin numbering is that of a female connector functioning as the graphics adapter output. In the male connector, this pin numbering corresponds with the mirror image of the cable’s wire-and-solder side.
at least some of pins 4, 10,11, 12, and 15 should be connected to pass EDID data through.

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Baddoll wrote:
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Display Preferences does not detect dual monitors.
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Thanks for the question. Based on what you stated, it seems like the computer is not recognizing a second display. I would recommend that you read this article, it may be able to help you resolve or isolate the issue.
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