haha..feel sorry to u bro.

a newly bought mobo crash on sight

Normally, nowdays, almost all mobo have Power detection LED.

which means, if you connect psu + on the main switch (not at the rig), there must be some LED light shows up, to detect there is power circling around the motherboard.

try this POST trouble shoot :

Only connect PSU + mother board + RAM + Display (if got onboard Display, use it) + Keyboard.

If got some beep beep sound, then maybe RAM/Display Card (if any) errors.

If can successfully see POST, then ok edi.

IF nothing happen, then i think mobo/psu ... but since psu is okay..then mobo la...haha