I have an iMac with a blank hard drive. The HD has been erased and formatted using the Disk Utility. Now I want to install MacOS -- any MacOS.

When I try to install High Sierra from a 16 GB USB drive, it appears to work but then stalls with "2 minutes remaining". The bar is at about three-quarters. The pop-up message says: "An error occurred while preparing the installation". There is no error number or further explanation. This has happened three times. The same USB was used to successfully upgrade another iMac of the same model, but that one had El Capitan installed first. Anybody care to offer a guess as to what is happening?

So, I guess I need to create another bootable USB drive. Perhaps El Capitan will work better? Before you ask, my iMac is definitely compatible with High Sierra.

Does anybody have any suggestions?

  • 2
    It would be helpful if you added the model of iMac in question to your question. – Steve Chambers Jun 16 '18 at 20:21
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    Along with @SteveChambers suggestion, if it is newer, you should first try the internet recovery option, but we don't know your model yet. – Jahhein Jun 16 '18 at 20:47
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    How do you determine the model of a machine that has no OS installed? I do know that it is too old to use Alt-Control-R for Internet recovery, but not too old to handle High Sierra. – Maggie Cummings Jun 17 '18 at 1:19
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    You can find the model by looking up the serial number here: powerbookmedic.com/identify-mac-serial.php. The serial number is printed on the bottom of the base. – Elliott Jun 17 '18 at 6:16
  • Since my original post, I've done the following: – Maggie Cummings Jun 18 '18 at 12:16

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