Fishrrman
macrumors Nehalem
OP:
Again, you have never told us WHAT YEAR the iMac was made.
Having that knowledge changes everything.
If you were able to download the Mavericks OS installer, I suggest you try BOTH of these:
DiskMaker X:
Install Disk Creator:
macdaddy.io
Use a USB flash drive that is 16gb or larger. (8gb -might- work).
The version of DiskMaker I linked to is the one for Mavericks.
I'm NOT SURE if the Install Disk Creator app will work for Mavericks, but if DiskMaker fails, try IDC anyway, just to see.
Again, you have never told us WHAT YEAR the iMac was made.
Having that knowledge changes everything.
If you were able to download the Mavericks OS installer, I suggest you try BOTH of these:
DiskMaker X:
Install Disk Creator:
Install Disk Creator — Free Bootable macOS USB Installer Maker
Create a bootable macOS USB installer in under a minute — no Terminal. Downloads official macOS installers from Apple and verifies the drive. Free, for Apple silicon and Intel.
macdaddy.io
Use a USB flash drive that is 16gb or larger. (8gb -might- work).
The version of DiskMaker I linked to is the one for Mavericks.
I'm NOT SURE if the Install Disk Creator app will work for Mavericks, but if DiskMaker fails, try IDC anyway, just to see.