Wonder if I did something wrong above? Any ways to check the status of my 1TB HDD? Thanks for your kind help and sharing. Somehow I can't boot from the first two, all would led to the prohibited sign again. If the installer asks to unlock your disk, enter the password that you use to log in to. Click Continue, then follow the onscreen instructions. Reinstalling macOS won’t remove your personal data. However, when I boot the iMac with Option Key, it showed three disks: Macintosh HD, Recovery, and the USB installer. When you see a window with the option to reinstall macOS, this means your Mac has started up from Recovery. I tried to use the Mac terminal command diskutil list, it only showed my 8G USB disk, not the internal 1TB HDD. With the USB flash card of Mac OS Sierra installer I can boot the iMac, but from the Disk Utility I can't see Mac's internal 1TB HDD at all, so it means that there are no disk volume to install Mac OS sierra at all. Ketika terdengan suara bootup, tekan tombol Command+R sampai muncul logo booting Apple dan tunggu hingga selesai. Berikut cara install MacBook Pro: Masukan flashdisk bootable Mac, kemudian restart Mac. I tried safe/recovery mode to boot, always showed the prohibited sign! Then I decided to make a USB Mac OS installer to reinstall Mac OS Sierra because I suspected all the troubles might be caused by High Sierra's new APFS. Namun perlu diingat, kamu membutuhkan koneksi internet agar dapat clean install Mac OS X ini. For a few days my iMac seemed working fine, but then it became very slow, eventually can't boot at all, showed the prohibited sign. About one month ago I upgraded my old iMac to High Sierra 13.6 without much thinking of risks involved.
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