Let me rephrase what I was trying to help you do.
Test your M2-ATX with a cheap simple tester, if the LEDs don't light up, then you can tell your vendor and he will exchange it.
It's simple, no need to do anything furthuer, it should work without adding resistors to change the ramp timing, leave that to them if they screwed it up.
But you keep telling me that my tester won't work, well if it doesn't it doesn't but maybe it will. If it does work as I said in my FAQ, it will take the guesswork out of what is and is not working.