OK i found the issue !
For many reason that i don’t understant there IS a prb with my pc for creating a boot partition. That a fact with all distrib’, linux or Windows .
So, i take another pc in EFI whithout any bootloader (no OS in it). I install manjaro on the externe HDD from the other pc. After that, i just put thé extern HDD on the first pc ans it’s works !
Thanks for u help guys !