Get message
unmounting disk
couldnt open device .. (-69877)
operations failed
What year model iMac?
Identify your iMac model - Apple Support
You have to startup from a different disk. It can be the original Install DVD, an external startup disk or macOS Recovery Mode depending on the year model.
What year model iMac?
Identify your iMac model - Apple Support
You have to startup from a different disk. It can be the original Install DVD, an external startup disk or macOS Recovery Mode depending on the year model.
You're welcome.
You bought it used or new from Apple?
If it is used, you may have trouble if the previous owner did not properly prepare it for resale.
What to do before you sell, give away, or trade in your Mac - Apple Support
If it is new, then you need to use macOS Recovery Mode to erase and reinstall macOS.
About macOS Recovery on Intel-based Mac computers - Apple Support
It’s a 27 inch iMac with Intel processor... bought just 2 weeks ago
thanks
Trying to erase disk in iMac ... get message
