Not detecting second screen

There is only one monitor showing up in device manager>monitors. If i swap the two wires in the back of the pc around, the second screen then works but the first screen does not.
 

My Computer

Computer Manufacturer/Model Number
Acer
OS
Windows 7
CPU
Intel(R) Core(TM)2 Quad CPU Q9300 @ 2.50GHz 2.50 GHz
Memory
4 GB
Graphics Card(s)
GeForce GTX 470
Sound Card
Realtek Digital Output (Realtek High Definition Audio)
Monitor(s) Displays
24" samsung
Screen Resolution
1920 x 1080
Case
Aspire M7711
Keyboard
Razer Lycosa
Mouse
Logitech G9
Internet Speed
20 MB
Then yeah it's a wiring problem. Replace the faulty DVI connector and it should work.
 

My Computer

OS
Windows 7 Enterprise x64 SP1
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