Remove Inject Nvidia from your config.plist and use the Nvidia drivers. Test: you have have 3 display ports on your G1 960. Test booting from each individual port for a successful boot.
Hello wild willow, I have always done all possible set ups without the inject nvidia, to no avail. The set-up never recognised the card as anything but a 7mb or 14mb display. Only when in a last attempt (and to minding ruining my settings), I added inject nvidia did it suddenly recognise the card. I had already tested all different display ports in both single and dual display cable configuration, also without success. The system either has he aforementioned problems or when on the wrong combination of ports, just goes to sleep mode. If you have any other suggestions about possible issues based on the uploaded images (see upload pie links in previous posts), I am very keen to try. However, I am quite sure there is a compatibility issue as there is literally no way to make it work. Over the past weeks, I've reinstalled osx 7 times to ensure clean plists (last clean install was yesterday afternoon), have ensured no nvidia (or intel) was injected, have tried modifying the plist with any change suggested by anyone and all the things I could think of myself, patched kexts, installed the webdrivers, both with and without additional cuda drivers just in case. I'm happy to try one final install with suggested settings, but all the days of work and tweaking I've got invested in this are starting to conflict with my work (and would have paid for a mac pro). It's more stubborn pride and the desire to keep running OSX that have kept me going at this than a rational decision. The nvidia injection yesterday was just a forlorn attempt at the seemingly impossible. As linux requires too much fiddling to get adobe, dxo and other software to run, I see no real other solution than going the windows way, perhaps until such time as the release of skylake macs which may sort compatibility issues. Alas, up for some final suggestions and I appreciate the help from all those who picked in so far, but it seems rather impossible. Cheers.
PS. If I just boot with the primary display port on my screen, I get the same results when connected with a single cable to port 0 on the card, any other port gives me display going to standby. However, I need the second cable for full 5K, but just using the second cable only gets display standby, adding it in one of the secondary ports on the card makes no difference. I'm using the latest released and recommended nvidia webdrivers (though the system shows osx default drivers, but if I switch them in the nvidia menu I am not prompted for reboot so it is probably a glitch with the system running the nvidia drivers all along).
