iMac: Get a refurbished 2010 iMac 21.5" Core i3. Operating system: Mac OS High Sierra operating system (released in 2017). Features: VGA, Bluetooth, Mini-Display port, Ethernet, SDXC and USB 2.0. Options: Choose to get an iMac with 4GB RAM and 500 HDD, 8GB RAM and 500 HDD or 8GB RAM and 1TB HDD. Processor: With a processor speed of 3.06 GHz. Warranty: 12-month warranty included! Apple 21.5 Core I3 iMac Computer | 4GB | Living Social