iMac 
iMac (Late 2013): iTunes audio distorts via Thunderbolt display
iTunes audio may have distortion such as pops, crackles, or drops when played through a Thunderbolt display.
Windows 8, iMac (Mid 2011): Keyboard screen brightness controls do not work
When using Boot Camp 5 and Windows 8 on a iMac (Mid 2011), keyboard screen brightness controls (F1 and F2) might not change the screen brightness.
iMac: "Windows 8 not supported on this Mac" alert message
When trying to install Windows 8 via Boot Camp, the alert "Windows 8 is not supported on this Mac" may appear.
iMac (21.5-inch and 27-inch, Late 2012): Memory specifications
Learn which kinds of memory to use with your iMac (21.5-inch, Late 2012) and iMac (27-inch, Late 2012).
iMac (27-inch, Late 2012): Installing or replacing memory
Learn how to install additional memory or replace the memory in your iMac (27-inch, Late 2012) computer.
iMac (21.5-inch and 27-inch, Late 2012): External features, ports, and connectors
Learn about the external features, ports, and connectors on iMac (21.5-inch and 27-inch, Late 2012) computers.
Avoiding image persistence on Apple displays
This article explains how to avoid image persistence on certain Apple displays, and describes the unique characteristics of IPS display technology.
OS X Lion: iMac may not automatically reconnect to Wi-Fi network after waking from sleep
After waking an iMac running OS X Lion v10.7.3 from sleep, the computer may not automatically reconnect to the Wi-Fi network it was associated with prior to sleep.
How to clean Apple products
Read recommendations and guidelines for cleaning your Apple computer, iPad, iPhone, iPod, display, or peripheral device.
