if you find some cockamamie way to support the board right under the CPU socket while persuading.. it helps.
Any chance of returning the mb + cpu and let seller 'test' it? Offhand I'd say that you have logically substituted about everything except the
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decal.
(Except, as Wade hinted at in another forum -- if there was a problem with the case-mounting - say Not making a one-point good ground? - well just maybe it'd work sitting on a piece of insulator and plugged in to all the entrails)
Luck,
Ashton