IBM 86625RY Hardware Maintenance Manual - Page 19

Diagnostic tools The following tools are available to help identify and resolve hardware-related problems: Diagnostic Programs Power-on self-test (POST) POST beep codes Error messages Troubleshooting charts Option diskettes For a list of error codes and messages, see "Symptom-to-FRU index" on page 285. Diagnostic programs The server diagnostic programs are stored in upgradable read-only memory (ROM) on the system board. These programs are the primary method of testing the major components of the server, such as the the system board, Ethernet controller, video controller, RAM, keyboard, mouse (pointing device), diskette drive, serial port, and parallel port. You can also use them to test some external devices. Also, if you cannot determine whether a problem is caused by the hardware or by the software, you can run the diagnostic programs to confirm that the hardware is working properly. Note A single problem might cause several error messages. When this occurs, work to correct the cause of the first error message. After the cause of the first error message is corrected, the other error messages might not occur the next time you run the test. To run the Diagnostic Programs, see "Running diagnostic programs" on page 14. For a list of error codes and messages, see "Symptom-to-FRU index" on page 285. Power-on self-test (POST) When you turn on the server, it performs a series of tests to check the operation of server components and some of the options installed in the server. This series of tests is called the power-on self-test or POST. POST does the following: Checks the operation of some basic system board operations Checks the memory Compares the current server configuration with the stored server configuration information Netfinity 5500 M20 - Type 8662 11