Horay horah finally sorted it out
Incompatabillity with Thermalright Toughpower 1200W psu.
Solution - hold down the power button for 7 seconds (the time it takes for the power to drain out of the mobo which is indicated by the DDR PHASE LED remaining lit or the onboard power switch remaining lit) then press the power switch imediately after those leds/power switch lights go out and it powers on.
My speculated conclusion is something to do with the 2 phase power for DDR ram implementation has an issue with this particular PSU.
So yeah, user error after allor perhaps more like user persistance to figure out the problem.
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