asus x407ma problem with no display Fixed https://bios-fix.com/index.php?threads/asus-x407ma-no-display.51017/#post-90618
Asus x407ma not power on full model is : Asus X407MA-BV002T MB: X407MA REV:2.0 BIOS CHIP :25Q64FWSIQ _ 18Volt