You are making things nearly impossible to faultfind as you are changing the spec as we go. Maybe you could list all your system components here in detail before we go any further.
Certainly not trying to confuse or increase the difficulty of troubleshooting.
mobo: p67a-ud7-b3 (bios F3)
CPU: intel 2600K (default clocks)
PS: 1250W
Memory: 4x4gb Vengeance
gpu: 580gtx sli
Heatsink: Corsair H70
After I tried to adjust the timings and the voltage, I have the bios set back to default settings (as per pics). All memory modules have been
tested in single configuration to ensure the are not defective. I did notice the mobo, memory led indicator displaying a green and a yellow
light while the cycling on/off was occuring. Consulting my mobo guide, it defines the yellow led as either overvoltage (strange, cause all settings
are default), and/or heavy loading. Sorry for the confusion and your help and patience are appreciated.