Specifications

Symptom Charts
How to Use the Symptom Charts
The Symptom Charts included in this chapter will help you diagnose specific symptoms related to the
product. Because cures are listed on the charts in the order of most likely solution, try the cures in the
order presented. Verify whether or not the product continues to exhibit the symptom. If the symptom
persists, try the next cure.
Note: If you have replaced a module, reinstall the original module before you proceed to the next cure.
Apple Hardware Test
Apple Hardware Test is a diagnostic tool for detecting problems with Apple internal hardware components
such as logic board, memory, modem, video RAM, and Apple AirPort Card. The test does not check
externally connected hardware components such as USB or FireWire devices; it also does not check non-
Apple devices such as third-party PCI cards.
Note: The most recent Apple Hardware Test software can be downloaded from the CD Images page on
AppleCare Service Source; go to the Service Source home page and select ‘Disc Images’ from the quick-
click table.
Error Codes
If Apple Hardware Test detects a problem with a computer, it displays an error code, which is defined in the
product's Error Code List. Consult the list for appropriate repair procedures associated with the code.
All Error Code Lists are included in the Service Diagnostics Matrix, Knowledge Base article 112125. You
can also access this matrix by clicking the Service Diagnostics rollover link under any of the product areas
on the Service Source home page.
14 - iMac (Flat Panel) Troubleshooting
Symptom Charts