If your new GPU is an nVidia from the supported list try installing it and booting SL to see if SL will support it.
If it will, remove the 9500GT, switch the new GPU to that PCIe slot, boot the ML UniBeast USB and install.
Recommend at least erasing the SL partition if you do not reformat the entire drive.
GB thanks a million for your help. Will buy a New Card as per list and will report back the outcome.
Regards
Hi GB
Its been difficult to locate a GPU as per your GPU list as these are old cards and no longer manufactured.
However I did manage to buy one GeForce GTX 670 and report back as follows, with snap shots.
A) Installed New GPU GTX 670 into PCIe Slot2.
Booted and got Blank Blue Screen.
Switched monitor Connection on GPU, same Blue screen (but noticed the HDD Activity Led indicating that the system loaded
but NO Graphics on monitor).
B) Reconnected monitor cable back to Original GPU (which is on PCIe Slot1), the system booted perfect into Snow Leopard.
While in Snow Leopard, please note the showing of Cards on PCIe Slots1&2.
4 snap shots included.
Please advise what to do next.
I will appreciate it if you could please advise urgently as I have 10 Days to return the New GPU back to eBay seller.
Kind regards