Format and restore my iMac ?
How do I get an Operating system back on my iMac once I format the drive?
iMac 27″, macOS 10.15
How do I get an Operating system back on my iMac once I format the drive?
iMac 27″, macOS 10.15
No, you shouldn't. Give it a try and see. If you don't have a recovery volume then you will need an external flash drive with a bootable installer on it. This describes how: How to create a bootable installer for macOS
Boot into the Recovery volume (boot with the Command + R keys held down) and install the system from there.
Old Toad, will I need an OS Disk?
Thank you a lot.
👍
Format and restore my iMac ?