S1rrah! Glad to see you back, I am relieved to know that you are in one piece
I trust that you are well on your way to general recovery from that little wind-storm?
It was a long night... and morning, so I am a little scattered.... forgive my brevity.
Mornin' Gents...
Good news, and bad news: The good news is that the Motherboard modifications went well. The bad news is that one of the video cards is not functioning. I will post a thread about that in awhile... and there is some other good news - temperatures. The EK block with a 480 radiator dropped the temperature to:
(ambient was 19 C at time of reading)

note: ignore the CPU temps as the loop was only about 10 -minutes old and full of bubbles.
Here are some shots of the water-loops being installed, bled and tested:
The problem:
The image below shows the backside of the GPU. There is are five (insert correct terminolgy here) glowy thingies, that flicker on, then shut off on the card that works.
On the card that does not work, the outside 2 remain illuminated and there is a constant "ticking" noise (kinda like a GPU under load).
Arrows point to the referenced parts:
Notes:
- The card does not work by itself.
- There was a hang-up/re-start on "VGA BIOS" at one point during POST
- GPU is not recognised by the OS
- GPU is not recognised by CCC
- I did not drop it, or expose it to ESD (that I am aware)
Could I have somehow borked the BIOS on the GPU?
How can I go about troubleshooting more?
Any assistance is greatly appreciated.