Cannot set to recovery mode
inwant to send back my Mac and cannot erase completely
iMac 21.5″, macOS 10.13
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soledad Said:
"Cannot set to recovery mode: inwant to send back my Mac and cannot erase completely"
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Using this Site?: What to do Before you Sell, Give Away, or Trade In your Mac - Apple Support
As for the Hard Drive:...
1. Mount the Disk:
In Recovery Mode, do you see the "Mount" button available to click? If it reads "Mount", then click it to mount it. From there, click erase.
Once Mounted...
2. Use the "First Aid" Button:
While in Recovery Mode Also, select the hard drive, and then click First Aid button. From there, run First Aid on the drive.