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The iMac (Early 2006) computer has two SDRAM slots in the bottom of the computer. The iMac ships from the factory with at least 512 MB of DDR2 SDRAM installed into the top slot. (The computer may come with more RAM in the top slot or RAM in the bottom slot, depending on how you ordered the computer from Apple.)
The iMac (Mid 2006) ships from the factory with at least 512 MB of DDR2 SDRAM, in two 256 MB DIMMs; one in each of the memory slots.
Note: If you upgrade the memory in your iMac (Mid 2006), make sure you have matching size SO-DIMMs in each slot for best graphics performance.
The iMac (17-inch Late 2006 CD) ships from the factory with at least 512 MB of DDR2 SDRAM, in two 256 MB DIMMs; one in each of the memory slots. All other models of iMac (Late 2006) ship from the factory with at least 1 GB of DDR2 SDRAM, in two 512 MB DIMMs; one in each of the memory slots.
The maximum amount of RAM you can install in the iMac (Early 2006), iMac (Mid 2006) and iMac (17-inch Late 2006 CD) is 2 GB total (a 1 GB SO-DIMM in each of the two slots). The maximum amount of RAM you can install in the iMac (Late 2006) models other than the one mentioned above is 4 GB total (a 2 GB SO-DIMM in each of the two slots) but the computer will only use a maximum of 3 GB of RAM. Refer to iMac (Late 2006): Memory Specifications for more information.
You can use small-outline dual inline memory modules (SO-DIMMS) of 512 MB or 1 GB that meet all of these criteria:

PC2-5300
unbuffered
nonparity
200-pin
667 MHz DDR2 SDRAM

DIMMs with any of the following features are not supported in this iMac:

registers or buffers
PLLs
ECC
parity
EDO RAM

Users who used Wiki Server under Mac OS X Server v10.5 may experience issues starting up the server after an update to 10.6.4 or later. If short names of wiki groups were changed in 10.5, there may be wiki folders whose metadata.plist files contain duplicate GUIDs. The following log message will be written to /Library/Logs/wikid/error.log on update:

File "/usr/share/wikid/lib/python/apple_utilities/MigrationManager.py", line 283, in migrateEntityFolder
  oldOwner = aGroup.data.get(‘owner’, None)
exceptions.AttributeError: ‘NoneType’ object has no attribute ‘data’

There are two ways to get iTunes content from your computer to Apple TV—syncing and streaming. This document explains the differences between syncing and streaming on Apple TV with software version 1.x.

This article describes several ways to find your iPad serial number and the Identifier (UDID)—Wi-Fi and Wi-Fi + 3G models—as well as the International Mobile Equipment Identity (IMEI) number, Cellular Data Number (CDN), and Integrated Circuit Card ID (ICCID) number (Wi-Fi + 3G model only).

Learn more about the memory used with Mac mini (Early 2009), Mac mini (Late 2009), and Mac mini (Mid 2010).

On some noncompliant Mini-DisplayPort to HDMI adapters, the audio signal may not be passed to the HDMI device.

Learn about the power supplies in various Apple products and whether they can switch automatically to voltages in other countries.
Some Apple computers have an auto-switching power supply which monitors the incoming voltage and automatically switches itself accordingly. Other Apple computers have a power supply that must be manually switched for various incoming voltages. In this case, the change is made by moving the voltage selector switch which is accessible from outside the computer’s case. Still other Apple computers have a power supply that is rated only for the country in which it is sold and it cannot switch to other voltages.
The table below shows what type of power supply is in various recent Macintosh models. Some models can use the World Travel Adapter Kit. If your computer cannot use the World Travel Adapter Kit and you need a power adapter or power cord with an appropriate plug, contact an Apple-Authorized Service Provider (AASP) in the region.

In Activity Monitor, the CPU Usage and history show a separate graph for each core if the Mac has four processor cores or less, but a single graph if there are more than four cores.

Learn about the external ports and connectors on your Mac mini (Mid 2010) computer.

Logic Express 9 and Logic Pro 9 are both powerful music production applications that share all but 3 features. The main differences are not between the features of the respective applications, but between the plug-ins, content, and additional applications that are bundled in the products they come packaged in. This article provides a summary of those differences.