crwdns2934241:0crwdne2934241:0 xiao zheng shen

crwdns2934249:0crwdne2934249:0:

Power Off MacBook, Disconnect HDD, Press and hold Option key then Press Power Button, screen will work and its show wifi name and cursor, immediately insert bootable usb, as it is Condition, reconnect hdd strip, then hit bootable media(usb)wait for loading and reinstall macOs,

this fixed for me

crwdns2915684:0crwdne2915684:0:

open