![]() ![]() Then click the erase button and erase it to APFS, GUID partition format. I've never used a Mac with a fusion drive, so at this point you're going to have to look over at "the list on the left" and select the internal fusion drive, which I think will be "the top line". VERY IMPORTANT - go to the "view" menu and choose " show all devices". Once the flash drive is booted, if the installer opens, QUIT IT for now. IS THE REST OF THE STUFF ON THE iMAC'S DRIVE BACKED UP? Actually, if Ventura is on it, that's what you HAVE TO do. Once you have the flashdrive ready, boot to it (hold down the option key at boot to invoke the startup manager).Īt this point, I would recommend that you ERASE the internal fusion drive and "start over". I recommend BOTH of them, because if one doesn't work for you, you can try the other one. I would also recommend that you download BOTH of the following:īoth of these are free utilities that will make creating the bootable flash drive easy. You'll need a copy of the Monterey installer (get it from link above) Format it to "Mac OS extended, journaling enabled, GUID partition format". You will need a 16gb (or larger) USB3 flash drive. If you want Monterey, I'm thinking that you're going to have to download a copy of the Monterey installer, then create a BOOTABLE flash drive, and use that to do the install. The second key combo will offer the OS that originally shipped with the iMac, which I believe is 10.12 "Sierra". HOWEVER, I don't believe either of these will offer Monterey. You can boot to internet recovery (NOT THE SAME AS "the recovery partition"): I maintain PCs in a library environment, and this is our only Mac. ![]() I really want to get this Mac going for the public. I have to use my phone as a wireless hotspot to get as far as I did! But that's a side issue. Why is there no provision to use the Ethernet babled network - only a wireless connection comes up, and our Library has a security page you have to approve in a browser, so the connection on the Mac fails. What am I doing wrong? How do I unlock the drives to reinstall the OS, and which one do I use?Īnd while we're on the subject, our Mac is wired to the network with an Ethernet cable. When I exit and go to disk manager, First Aid complete fine when I unmount both of them, but if I leave them unmounted then Install MacOS doesn't see them. When I try to select either of the two drives that show up, Macintosh HD and Update, it says they're both locked. I hold down -R when booting and get to the menu with disk manager and try to reinstall MacOS High Sierra. So I went ahead and wiped the drive, figuring I'd reinstall everything anyhow. I tried to back it up with Time Machine, but it wouldn't recognize my NAS network drive, my 1TB USB drive, or a 32GB USB flash drive, even though the Finder saw all three. I upgraded to Ventura, then found a critical application won't run on it, so I have to roll it back to Monterrey. Our Library has a fusion drive Mac that dates to 2018. ![]()
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