Hello everybody.
My graphic card works well but one thing that doesn't work is the monitor calibration. I tought at first thta it was a problem of OSX and my computer so I bought a spyder3 express and the problem still exist. I can't calibrate the monitor. I tried to switch the cables but nothing change. Seems like the driver doesn't work or something. I have some kext installed NVEnabler 64 e nvinject. Maybe that is the problem. from the system information i get this

GeForce 8800 GTS:

Chipset Model: GeForce 8800 GTS
Type: GPU
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 320 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x0193
Revision ID: 0x00a2
Displays:
W2353:
Resolution: 1920 x 1080 @ 60 Hz
Pixel Depth: 32-Bit Color (ARGB8888)
Main Display: Yes
Mirror: Off
Online: Yes
Rotation: Supported
Display Connector:
Status: No Display Connected


WHAT CAN I DO?

THAnk you so so sos much

Same problem here, I'v a GT240 and GeForce 8800 GTS:

Chipsetmodel: GeForce 8800 GTS
Type: GPU
Bus: PCIe
Sleuf: Slot-1
Breedte PCIe-baan: x16
VRAM (totaal): 320 MB
Fabrikant: NVIDIA (0x10de)
Apparaatcode: 0x0193
Revisiecode: 0x00a2
ROM-revisie: xx.xx.xx - internal
Beeldschermen:
Philips 200W:
Resolutie: 1680 x 1050 @ 60 Hz
Pixeldiepte: 32-bits kleur (ARGB8888)
Hoofdbeeldscherm: Ja
Synchrone weergave: Uit
Online: Ja
Rotatie: Ondersteund
Beeldschermconnector:
Status: Geen beeldscherm aangesloten

I've switch cards to try it but its definitely something in the cards, BIOS flash?
Strange that with the same install a 8800GT, 256MB works fine.
A 7300GT, 256 MB works fine

[EDIT]
Tried a lot of VBIOS's but all the same, no calibrate.
Used other install methods EmphireEFI and iBoot. No difference.
Tried 10.6.0-10.6.4. Nothing helped.
Different EFI strings, even customs EFI strings. Nothing changed, still no calibrate?

Hope someone can help us.