That is a specific window-thrower lol. I'm standing my brain annoying to believe of what could probable be doing it--you've already cleared CMOS as well as restored the mobo so I believe it is safe to rule that out. The RAM could have been overvolted by your old PSU, causing it to still be bad however doubtful.

You said you tried attractive the whole fix beyond the case (to be sure it isn't somehow grounding out or shorting due to a bad contact on the mobo/case) right?