Lenovo ThinkCentre M72z Hardware Maintenance Manual (HMM) for ThinkCentre M72z - Page 64
POST error codes, Power-On Self-Test
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The following tables describes beep symptoms. Beep Symptom 2 short beeps CMOS setting error 3 short and 1 long beeps DRAM memory error FRU/Action Common error code, see the detail failure information in "POST error codes" on page 58. 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. Error code 0135 0211 0164 1762 1962 POST Error Message Fan failure Keyboard not found Memory size decreased Configuration change has occurred No operating system found. Press any key to repeat boot sequence. Description/Action The system might be overheating. Press F1 to enter Setup, F2 to resume. Note: If the problem is caused by the microprocessor fan, press F10 will not solve the problem. When there is no keyboard detected, the error message will be displayed. Press F1 to enter Setup, F2 to resume. This error message is displayed when a hard disk drive or optical drive change has been made. Press F1 to enter Setup, F2 to resume. This error occurs only after the POST is completed. Press any key to repeat boot sequence. 58 ThinkCentre Hardware Maintenance Manual