actually one possibility is that you didn't plug in CPU power connector which is separate from the 24 pin ATX power connector.

make sure every molex power connector on motherboard has something plugged into it.

but i think usually a motherboard will beep when that is the case.

try swapping PSUs. use one RAM stick at a time. try different sticks in different slots.

do not connect anything not absolutely essential to get to POST.

if it is still dead sent it back for refund and get an Asus.