Good news!

I went back to the initial drivers, and following lanceomni`s advice not to have 2 drivers installed, i followed the 'procedure' , removed the nvinject and only left the Titan drivers ..and it works!!

Generic NVIDIA:

Chipset Model: Generic NVIDIA
Type: Display
Bus: PCIe
PCIe Lane Width: x16
VRAM (Total): 128 MB
Vendor: NVIDIA (0x10de)
Device ID: 0x016a
Revision ID: 0x00a1
Displays:
SyncMaster:
Resolution: 1680 x 1050 @ 60 Hz
Depth: 32-bit Color
Core Image: Hardware Accelerated
Main Display: Yes
Mirror: Off
Online: Yes
Quartz Extreme: Supported
QuartzGL: Supported
Rotation: Supported
Display Connector:
Status: No display connected

................

Thanks a lot guys!

If it helps anyone else, the only files i have left from my initial setup are:

NVDANV10Hal.kext
NVDANV20Hal.kext
NVDANV30Hal.kext
NVDANV40Hal.kext
NVDANV50Hal.kext
NVDAResman.kext
Titan.kext

i dunno if NVDA and Titan are still 2 different drivers, but i think im u sing Titan now (from what i can see on a -v boot)