Apple imac 21 5 inch late 2009 User Manual

iMac (21.5-inch, Late 2009) — Feedback 11 2010-11-18
• Logic Board: Added note that logic board may be easier to remove if RAM is removed first.
Views
•  Exploded Views: Added part numbers for Power Supply Pressure Wall (922-9281), Backlight 
Pressure Wall (922-9282), Bluetooth Antenna (922-9283), and AirPort Antenna (922-9284).
Updated 28 October 2009
• Basics: Added another kBase link to Wireless Troubleshooting section.
•  Troubleshooting: General: Added another kBase link to Wireless Troubleshooting...

© 2010 Apple Inc. All rights reserved.
 Apple Technician Guide 
Basics
iMac (21.5-inch, Late 2009)   

iMac (21.5-inch, Late 2009) Basics — Overview 13 2010-11-18
Overview
Identifying Features
The iMac (21.5-inch, Late 2009) has an all-aluminum enclosure with a glass front.  It can be 
distinguished from the previous model by the glass extending all the way to the top, left and 
right edges, rather than having an aluminum bezel that borders the glass.  Also, the rear of the 
computer is aluminum rather than black plastic. 
This model’s other new features include:
• Larger and LED-backlit 21.5-inch 16:9...

iMac (21.5-inch, Late 2009) Basics — Overview 14 2010-11-18
Product Configurations
For product configurations, refer to AppleCare Tech Specs: http://support.apple.com/specs/
Wireless Troubleshooting
If you’re having issues with Bluetooth and wireless connectivity issues, refer to the following 
Apple Knowledge Base articles:
kBase #TS3048: Desktop computers: Troubleshooting wireless mouse and keyboard issues 
kBase #HT1365: AirPort and Bluetooth: Potential sources of interference for wireless 
devices...

iMac (21.5-inch, Late 2009) Basics — Safety 15 2010-11-18
Safety
Warning: HIGH VOLTAGE: The AC/DC power supply PCB remains powered up whenever 
system is plugged in, whether or not system has been turned on. Use extreme caution 
when troubleshooting system with glass panel removed. 
Important: If computer is shut down by removing power cord, allow power supply a good 2-3 
minutes to discharge capacitors before handling it.  However, if you select “Shut Down” via the 
Apple menu, the computer will...

iMac (21.5-inch, Late 2009) Basics — Serial Number Location 16 2010-11-18
Serial Number Location
The iMac (21.5-inch, Late 2009)’s serial number is located on the bottom of the stand. When 
replacing a stand, transfer the serial number to the new stand.  

© 2010 Apple Inc. All rights reserved.
 Apple Technician Guide 
Troubleshooting
iMac (21.5-inch, Late 2009)   

iMac (21.5-inch, Late 2009) — General Troubleshooting 182010-11-18
General Troubleshooting
Wireless Troubleshooting
If you’re having issues with Bluetooth and wireless connectivity issues, refer to:
• Bluetooth Service Diagnostic (BSD) self-paced training
•  Bluetooth Troubleshooting Course
•  kBase #TS3048: Troubleshooting wireless mouse and keyboard issues
•  kBase #HT3887: Wireless input devices: Bluetooth frequently asked questions
•  kBase #HT1365: AirPort and Bluetooth: Potential source of...

iMac (21.5-inch, Late 2009) — General Troubleshooting 192010-11-18
Common Reset Procedures
Power On Self Test (POST )
Intel-based Mac computers such as the iMac rely on a combination of tones to indicate Power 
On Self Test (POST ) error codes.
• If the computer detects out-of-specification or no SDRAM, the screen will remain black 
but the computer will beep.  This error condition may be due to physically damaged RAM, 
installing incorrect type of RAM, or not having RAM installed.
•  Some RAM may appear...

iMac (21.5-inch, Late 2009) — General Troubleshooting 202010-11-18
Resetting Parameter RAM (PRAM)
PRAM stores certain system and device settings in a location that Mac OS X can access quickly. 
Exactly which settings are stored in the computer’s PRAM varies depending on the type of 
computer as well as the types of devices and drives connected. To reset PRAM:
1.  Shut down the computer.
2.  Locate the following keys on keyboard: Command, Option, P, and R. You will need to hold 
these keys down...