Mac 21 Manual

Have a new Mac?

Learn how to set up your new Mac and discover features that let you do more than ever.

Get to know your Mac

Distribute This Page: Bookmark & Share Download: PDF Manual The iMac 'Core i5' 2.5 21.5-Inch Aluminum (Mid-2011) is powered by a Quad Core 2.5 GHz Intel 'Core i5' I5-2400S (Sandy Bridge) processor with a dedicated 256k level 2 cache for each core and a 6 MB shared level 3 cache. Repair guides and support for 21.5' Intel iMacs by Apple. IMac Intel 21.5' troubleshooting, repair, and service manuals.

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Set up your new Mac

Use these basic setup steps to get your new Mac up and running.

Start setting up

How to move your content to a new Mac

Use Migration Assistant to copy all of your documents, apps, user accounts, and settings to a new Mac from another computer.

Mac 21 Manual Free

Move your content

Mac 21 Manual 2016

Use 4K displays, 5K displays, and Ultra HD TVs with your Mac

Learn about Mac support for 4K displays, 5K displays, and Ultra HD TVs. Also learn about the system requirements and how to set up and adjust the display or TV.

See displays

Get help with video issues on external displays connected to your Mac

Try these steps if the image on an external display connected to your Mac is blank or doesn't look the way you expect.

Get help with video

Connect an AirPrint printer to a Wi-Fi network

You can connect an AirPrint printer to a Wi-Fi network for wireless printing from your Mac, iPhone, iPad, or iPod touch.

Learn about AirPrint

If you can't print from your Mac or iOS device

If you can't get your printer to work with your Mac, iPhone, iPad, or iPod touch, these steps might help.

Get help with printer issues

If your Mac doesn't connect to the Internet over Wi-Fi

If your Mac is set up to connect to a Wi-Fi network, it can analyze the connection for issues that affect its performance, including its connection to the Internet.

Mac 21 ManualGet help with Wi-Fi

Use AirDrop on your Mac

With AirDrop, you can wirelessly send documents, photos, videos, websites, map locations, and more to a nearby iPhone, iPad, iPod touch, or Mac.

Learn more about AirDrop

How to AirPlay video and mirror your device's screen

Use AirPlay to stream or share content from your Apple devices to your Apple TV or AirPlay 2-compatible smart TV. Stream a video. Share your photos. Or mirror exactly what's on your device's screen.

Use AirPlay

Using a Bluetooth mouse, keyboard, or trackpad with your Mac

Learn about connecting Bluetooth input devices to your Mac, and get tips for using them.

Connect devices

Recharge the built-in battery in your Apple keyboard, mouse, or trackpad

Learn about charging the built-in battery of your Magic Keyboard, Magic Keyboard with Numeric Keypad, Magic Mouse 2, and Magic Trackpad 2.

Learn how to recharge

If your Apple wireless mouse, keyboard, or trackpad isn't working as expected

Try these steps to fix issues with your Apple wireless mouse, keyboard, or trackpad.

Get help with mouse, keyboard, and trackpad

iMac memory specifications

Learn about the types of random access memory (RAM) and video memory (VRAM) used in iMac computers.

See memory types

Install memory in an iMac

Get memory specifications and learn how to install memory in iMac computers.

Install memory

macOS Support

macOS is the operating system that comes with your Mac. Learn about and get help with apps, updates, services, and more.

Have a question? Ask everyone.

The members of our Apple Support Community can help answer your question. Or, if someone’s already asked, you can search for the best answer.

Ask now

Tell us how we can help

Answer a few questions and we'll help you find a solution.

Get support {{#tradeupBanner}}

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21.5-inch iMac

Mac 21 Manual Pdf

2.3GHz Dual-Core Processor with Turbo Boost up to 3.6GHz
1TB Storage

  • 2.3GHz dual-core 7th-generation Intel Core i5 processor
  • Turbo Boost up to 3.6GHz
  • 8GB 2133MHz memory, configurable to 16GB
  • 1TB hard drive1
  • Intel Iris Plus Graphics 640
  • Two Thunderbolt 3 ports
  • 1920-by-1080 sRGB display
$1,099.00

3.6GHz Quad-Core Processor
1TB Storage
Retina 4K Display

  • 3.6GHz quad-core 8th-generation Intel Core i3 processor
  • 8GB 2400MHz DDR4 memory, configurable up to 32GB
  • 1TB hard drive1
  • Radeon Pro 555X with 2GB of GDDR5 memory
  • Two Thunderbolt 3 ports
  • Retina 4K 4096-by-2304 P3 display
$1,299.00

3.0GHz 6-Core Processor with Turbo Boost up to 4.1GHz
1TB Storage
Retina 4K Display

  • 3.0GHz 6-core 8th-generation Intel Core i5 processor
  • Turbo Boost up to 4.1GHz
  • 8GB 2666MHz DDR4 memory, configurable up to 32GB
  • 1TB Fusion Drive1
  • Radeon Pro 560X with 4GB of GDDR5 memory
  • Two Thunderbolt 3 ports
  • Retina 4K 4096-by-2304 P3 display
$1,499.00

27-inch iMac

3.0GHz 6-Core Processor with Turbo Boost up to 4.1GHz
1TB Storage
Retina 5K Display

  • 3.0GHz 6-core 8th-generation Intel Core i5 processor
  • Turbo Boost up to 4.1GHz
  • 8GB 2666MHz DDR4 memory, configurable up to 32GB
  • 1TB Fusion Drive1
  • Radeon Pro 570X with 4GB of GDDR5 memory
  • Two Thunderbolt 3 ports
  • Retina 5K 5120-by-2880 P3 display
$1,799.00

Gow Mac 21-250 Manual

3.1GHz 6-Core Processor with Turbo Boost up to 4.3GHz
1TB Storage
Retina 5K Display

  • 3.1GHz 6-core 8th-generation Intel Core i5 processor
  • Turbo Boost up to 4.3GHz
  • 8GB 2666MHz DDR4 memory, configurable up to 64GB
  • 1TB Fusion Drive1
  • Radeon Pro 575X with 4GB of GDDR5 memory
  • Two Thunderbolt 3 ports
  • Retina 5K 5120-by-2880 P3 display
$1,999.00

3.7GHz 6-Core Processor with Turbo Boost up to 4.6GHz
2TB Storage
Retina 5K Display

  • 3.7GHz 6-core 9th-generation Intel Core i5 processor
  • Turbo Boost up to 4.6GHz
  • 8GB 2666MHz DDR4 memory, configurable up to 64GB
  • 2TB Fusion Drive1
  • Radeon Pro 580X with 8GB of GDDR5 memory
  • Two Thunderbolt 3 ports
  • Retina 5K 5120-by-2880 P3 display

Mac 21 Manual 2017

$2,299.00