Was the iMac prepared with What to do before you sell, give away, trade in, or recycle your Mac - Apple Support
If you cannot answer with confidence or the answer is “no” then return it ASAP to get your money back. If you do not or ignore the Mac will ALWAYS be associated with old owner and never operate correctly and possibly be nothing more than a door stop.Don’t laugh we get your types of posts daily and the answer is always the same!!!!
NEVER EVER buy a used Mac from:
- Ebay
- Craigslist
- Nextdoor
- Amazon
- Marketplace
- Local PC shop
- Friend, neighbor, acquaintance or relative
Only purchase an Apple refurb from Apple’s online store or from a reputable reseller such as Mac sales.com!!!!