Lenovo NetVista Hardware Maintenance Manual (HMM) for NetVista 6832 and 6833 s - Page 64

Index of Symptoms, Messages, Error Codes, or Beeps How to Use Error Messages: Use the messages, error codes, and beeps combinations that occur to diagnose failures. If more than one failure occurs, begin the diagnosis from the first failure that appeared. The cause of the first failure can result in false messages, error codes, or beeps. If you did not receive any messages, error codes, or beeps, see if the symptom is listed in "Table 2-3 Error Symptoms List" on page 38. CAUTION: When you have deemed it necessary to replace a FRU, and have done so, you must run a total system check to ensure that no other activity has been affected by the change. This system check can be done through the diagnostics program (Select Diagnostics, then select and execute All Tests from PC-Doctor). POST: Some diagnostic aids are resident in the machine, such as the Power-On Self Test (POST). The machine performs the POST each time it is powered on. Use this information throughout the diagnostic procedures. The POST is a series of system checks and initializations that verify the correct operation of the base system. After a successful POST, the system attempts to load the operating system. The system can be customized for different startup (boot) methods by the BIOS Configuration/Setup Utility. See "BIOS Configuration/ Setup Utility" on page 12. The system's default startup sequence automatically looks for the operating system files in the hard disk if these files are not found in the diskette. WARNING: Remember that POST does not test all areas, but only those that allow the system to operate well enough to run the diagnostics program. Table 2-1 lists BIOS error codes, messages, and their possible causes. Table 2-2 lists BIOS beeps and their possible causes. Table 2-3 lists error symptoms and their possible causes. The most likely cause is listed first. Make sure you complete all items in the cause or 32 IBM Desktop System HMM