Apple 2009 iMac - Page 3

iMac (21.5-inch, Late 2009)
Contents
About This Guide
Updates 9
Updated 18 November 2010 9
Updated 5 March 2010 10
Updated 8 January 2010 10
Updated 24 November 2009 10
Updated 28 October 2009 11
Introduced 20 October 2009 11
Feedback 11
Basics
Overview 13
Identifying Features 13
Product Congurations 14
Wireless Troubleshooting 14
Safety 15
Serial Number Location 16
Troubleshooting
General Troubleshooting 18
Wireless Troubleshooting 18
Update System Software & Firmware 18
Troubleshooting Theory 18
Hardware vs. Software 18
Common Reset Procedures 19
Power On Self Test (POST) 19
Resetting the System Management Controller (SMC) 19
Resetting Parameter RAM (PRAM) 20
Starting Up in Safe Mode 20
Diagnostics 21
Diagnostic LEDs 23
LED Functions 24