Question Z590 Vision D : POST led lights ?

Jan 30, 2022
I have just bought a Z590 Vision D motherboard and when I power on the system with cpu (with integrated graphic) , ram, there are no light coming on (not even a red light) but the cpu fan spin.
I stripped CPU, RAM and fan and still no light and i am wondering if there are any post light at all
My question is :
Where are those POST led on mb?
Do they actually exist ? (tried to watch youtube video with mb power on but have not been able to spot anything at all)
if they exist, is cmos clearing help?
if clearing cmos does not help, is flashing bios possibly help.

PSU was definitely working 6 months ago but not tested recently and this is my next step >
Thanks for helping,