This Hard-drive is fresh-loaded OSX 10 12 6 the fresh-load latest of Sierra before sending out
With this newer Fresh-loaded Sierra 10 12 6, this HDD keeps your iMac working several years better
Hard-drives in iMacs are compatible, so you just install, power-on and press the option key so the Mac will recognize the new drive
Choose the new drive to boot up the Mac, type in P/W 12345 and play...
***Make sure there is no other hard drive connected to your iMac when installing the new drive
***Because two different hard drives will make a conflict and destroy the new hard drive
Contact us if you need help after installing it
Check our feedbacks and decide yourself before buying it
It will work in late 2009 to late 2011 iMacs 21.5" and 2009 to 2016 iMacs 27"
***For iMac 2009 and 2010 "Old hard drive" must be Seagate to match with the temperature sensor
If not you have to by pass the temperature sensor to make the fan work right (last picture shows you How...)
You can up grade your iMac with older OS X such as Lion Mountain-lion Maverick Yosemite El Capitan by this one
You will not regret when up-grade and revive your loved iMac with this newer one
30 days free return if not working as described ( buyer must pay for the shipping for other reason)
Shipping by USPS small flat rate box to the USA only
Thanks for checking buying and asking questions from us
Have a good day..