Reset my iMac
My iMac is slow and screen blurry. I would like to set it back to factory settings and start all over. How?
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Hi, I reached to this level (see photo attached) and it looks like I can't go any further ...help!ther ...help!
You need to select the top level of the drive, Apple HDD… and erase it.
You can not erase the disk while you are booted up from the disk. You must startup in macOX Recovery Mode, as per the link that dialabrain posted, then you can erase and reinstall macOS.
Reset my iMac