Constant reboots after installing Quadro 3400

[Drunky McStumble]

My Mac OS X86 installation has been working like a charm since I first managed to get a Snow Leopard 10.6.2 distro to dual-boot with Windows XP over a year ago now, to the point that I have started to take it for granted and hardly ever even boot into XP any more...

 

Anyway, the original graphics card that came with the system - a GeForce 7300 GT, just died a horrible death earlier today and, desperate to get the system up and running again in order to finish some critical work I was doing in Xcode, I resorted to replacing it with the only other card I had lying around - a Quadro 3400 FX that I'd scavenged from an old workstation PC.

 

With the new card I managed to boot into XP and get the latest drivers, but whenever I try to boot into OS X now it just sits on the loading screen for a while before just hard rebooting, over and over and over.

 

The problem is that the original installation a year ago probably went a little too smoothly - OS X detected the GeForce 7300 without any hastles and I've never had to worry about drivers or enabling kexts or anything like that until now. I suddenly find myself horribly out of my depth and, since this forum was of immeasurable benefit to me back when I was trying to get my initial OS X installation to work, I thought I'd ask you guys for help.

 

EDIT:

 

OK, so after much reading around and head scratching today, I've managed to at least get OS X to boot up now, although it's stuck at 1024x768 and doesn't recognise the second monitor of my dual monitor setup. What I did was boot up with the -v option, where I found that the system was crashing just after NVEnabler gave "Probe Fails" and "Unknown Video Card" errors. I'm using Chameleon, by the way, which explains how NVEnabler got there.

 

So I eventually found a the device ID for the Quatro 3400 FX and added it to the NVidia kext plists as well as the NVEnabler kext according to this guide here: http://www.projectosx.com/forum/index.php?showtopic=4

 

So the system loads now, like I said, but it seems to be stuck on 1024x768 (there are no other options available under system preferences) which is absolutely killing my eyes since this is a widescreen monitor. Not only that, but I really need the dual monitor setup for work and I've been wracking my brain trying to figure out what else I could do to get OS X to recognise both DVI ports. Any ideas?