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Learn what to do if your iMac (21.5-inch, Mid 2010) or iMac (27-inch, Mid 2010) exhibits symptoms that indicate the wrong Mac OS X system software is installed. Symptoms may include:

Upon opening iMovie, a message states that iMovie requires a graphics card that is compatible with Quartz Extreme and that one or more of your graphics cards do not support Quartz Extreme. 
The computer may not go to sleep when you choose Sleep from the Apple () menu.
Difficulty opening or a message may appear when you open the DVD Player application.
Only one video resolution available in the Displays System Preferences pane.
Using the Grab application (located in the Utilities folder) to take a screenshot may produce only a blank image with a white background.
The correct LCD profile may not be present in the Color tab of the Displays System Preferences or under the profile in ColorSync Utility.
Compatibility and performance related graphics issues.
Compatibility issues with large-format SDXC memory cards.
Limited functionality with Magic Trackpad.
Both the Mac OS X v10.6.4 Update iMac (Mid 2010) and Mac OS X v10.6.4 update options are advertised for installation via Software Update.  
Note: If you attempt to install these updates at the same time, the updates will not work and you will need to restart your computer without installing either of the updates.

The tables in this article list the update or updates you should install on your Intel-based iMac computer. Under each iMac model is the list of updates that should be installed on your computer. If you are unsure if your iMac has a particular update installed, download and open the update installer. If the update is already installed, the installer will alert you to this fact.
 

Certain Mac Pro (Mid 2010) configurations may exhibit a kernel panic or otherwise appear unresponsive after you install Parallels Desktop 5 for Mac virtualization software or after you restart the computer.  You may also experience a kernel panic using the Parallels virtualization engine in 32-bit mode.  

Learn more about the power available via USB on Apple computers and displays and how to use peripheral devices that may require more power than is available through the USB port.

When you connect an Apple Cinema Display (30-inch DVI) to one of the products noted below, you may find that the highest available resolution is 1280 x 800, even though the optimum resolution for the display is 2560 x 1600. The maximum resolution available when this display is connected to a single-link DVI port is 1280 x 800; you must connect the display to a dual-link DVI port to access the higher resolutions available to the display.

Apple has discontinued support for certain technologically obsolete and vintage products.

In some situations, your migration may not seem to complete or may stop running and report a Network Connection message.

If you have three displays connected to each graphics card in one of the following configurations:

a Mac Pro (Mid 2010) that has either the ATI Radeon HD 5770 or ATI Radeon HD 5870 graphics upgrade kit
or
two ATI Radeon HD 5770 graphics cards
or
a Mac Pro (Early 2009) that has a ATI Radeon HD 5870 graphics card
 

… one of the following issues may occur:

When using a DVI connection, a Mini DisplayPort, and an HDMI connection, the display connected via DVI may turn black.
When using a DVI connection and two HDMI displays, the display connected via DVI may turn black.
When using a DVI connection and a HDMI connection, adding an additional HDMI connection or a Mini DisplayPort connection may cause the initially-connected HDMI device to no longer appear in the Graphics tab of System Profiler.

This article lists firmware updates that were released for Intel-based Macintosh computers. They update the firmware that originally shipped from the factory. If your computer does not appear on this list, an update from the factory firmware is not necessary.
Some firmware updates for Intel-based Macs may not be displayed automatically using Software Update. If they do not appear in Software Update, they must be manually downloaded from the Apple Downloads site. If you are unsure whether your computer needs a particular update, simply download and open the update installer. The installer will alert you if the firmware update is already installed or not needed.

This document contains frequently asked questions (FAQ) regarding the Mac Pro RAID Card and the Xserve RAID Card, with answers to those questions.