Not Detecting External Display - 24" Gateway FPD2485W

Hi everyone,
I'd really appreciate any help I can get on getting my monitor to display at 1920x1200.
My setup:
Mac Book Pro 2.2Ghz
4Gb memory
128 M video memory - NVidia GeForce 8600M GT Memory Card
OSX - 10.5.2
Bios - MBP 31.0070.B05
External Display - 24" Gateway FPD2485W
What I've tried... all manner of plugging in the display, then booting up, then laptop then powering up display. I've applied the latest bios. I've run apple-opt-P-R at startup.
I haven't yet been able to get it to detect this display. Can anyone confirm that the 128M card can handle the local display plus a 1920x1200 display? From what I've read, I believe this is possible. Anybody got any other suggests for me to detect the monitor and set a display resolution higher than 1440x900?
Thanks,
Alan

Hi Mac Wise,
Thank you for your response.
I am using the DVI connection and it displays normally, but just can't detect the monitor. It gives me the default 15" MBP resolutions... do you get different behavior? I can't go higher than 1440x900.
Thanks,
Alan

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          off-line, enabled, Vendor ffffffff, Model ffffffff, S/N ffffffff, Unit 3, Rotation 0
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Oct 27 20:47:02 SMBP.local WindowServer[80]: Display 0x003f003e: GL mask 0x4; bounds (2305, 0)[1 x 1], 1 modes available
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Oct 27 20:47:03 SMBP.local WindowServer[80]: **DMPROXY** (2) Found `/System/Library/CoreServices/DMProxy'.
Oct 27 20:47:03 SMBP.local WindowServer[80]: Display 0x042732c0: MappedDisplay Unit 0; ColorProfile { 3, "Color LCD Calibrated 2012-06-28"}; TransferTable (256, 3)
Oct 27 20:47:04 --- last message repeated 1 time ---
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