"d6" and "a3" error on external build

[Ragdoll47]

I've recently got my parts and I started to put together an external build. Powering up the Asrock p67 extreme4 I get a "d6" error.

Another concern is how to hook up the twin frozr 2 560 ti. It has an 12 (two 6's) slot PCI on the side but I'm confused on how to connect to it using the Antec High Current Gamer Series HCG-750 750W http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049&Tpk=750w%20antec%20gamer .

Do i need to connect through all twelve slots? The PSU comes with 2 PCI express cords, each with two 6+2 connectors. When I connected the 12 slots using two 6 connectors, the MB displays a "A3" code.

I need help please.

 

[Ragdoll47]

With the A3 code, the monitor says:
"P67 Extreme4 UEFI P1.70
CPU: Intel i5 2500K CPU at 3.3GHz
Total Memory: 8192MB

Press F11 for boot menu.
BIOS Defauts have been loaded.
Press F2 or delete to run setup
Press F1 to continue"

Is the system not recognizing the graphics card?