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?