Lenovo ThinkCentre Edge 91 Hardware Maintenance Manual (HMM) (April 2012) - Th - Page 71

Diagnostic Error Code 305-000-XXX Monitor DDC Test Passed 305-250-XXX Monitor DDC self test failure 415-000-XXXModem Test Passed 415-XXX-XXX Modem error FRU/Action No action 1. Run Setup to enable DDC 2. Cable 3. Monitor 4. Video card 5. System board No action Remove the Modem and re-test the system Beep symptoms Beep symptoms are tones or a series of tones separated by pauses (intervals without sound) during POST. The following tables describes beep symptoms. Beep Symptom 2 short beeps CMOS setting error 3 short beeps and then 1 long beep DRAM memory error FRU/Action Perform the following actions in order. 1. Start the Setup Utility program and press F10 to Save and exit. See Chapter 6 "Using the Setup Utility program" on page 43. 2. Start the Setup Utility program and press F9 to load defaults and then press F10 to Save and exit. 3. Perform a Boot-block recovery. See "Recovering from a POST/BIOS update failure" on page 250. Perform the following actions in order. 1. Make sure the memory module(s) are properly seated in the connector(s). 2. Replace the memory module(s). 3. Replace the system board. POST error codes Each time you power-on the system, it performs a series of tests that check the operation of the system and some options. This series of tests is called the Power-On Self-Test, or POST. POST does the following operations. • Checks some basic system-board operations • Checks the memory operation • Starts the video operation • Verifies that the boot drive is working If the POST detects a problem, an error message appears on the screen. A single problem can cause several error messages to appear. When you correct the cause of the first error message, the other error messages probably will not appear on the screen the next time you turn on the system. Chapter 7. Symptom-to-FRU index 67