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      Troubleshooting memory issues - Desktops

      It is important to make sure that you are using the correct part numbers when selecting computer memory. Any third party memory must be a direct replacement for the Lenovo option part number or replacement (FRU) number.

      Note: Some of the following steps may not apply to your system.

      1. Remove any non-standard or non-original branded memory from the computer.
        • Using incompatible memory is the most common reason memory upgrades do not work.
        • While incompatible memory may work to some extent, it can lead to unpredictable system behavior including data corruption and poor system performance including blue screen stops and intermittent lockups.
        • Memory installed after receipt of the system should be verified as fully compatible with the system.

      2. Reset the remaining memory modules firmly in their slots.
        • Memory and other components frequently become dislodged when other work is done inside the system or when the system is moved from one location to another.

      3. Ensure that all memory is properly configured, properly installed, and is designed with the correct technology.

        • To detect dual memory mode, the Power on self test setting in the System Configuration Utility must be set to "Enhanced".
        • To enable dual memory mode, both slots (slots 1 and 3, or slots 2 and 4) of a channel (channel A or B) must be populated. Memory modules must be oriented in the correct slots.
        • Dual inline memory technologies must match exactly. Refer to the "Installing memory" section of the system's User Guide for additional guidance.
        • A startup beep code of 1-3 typically indicates a memory problem. Go to Troubleshooting startup or booting issues to investigate beep codes.

      4. Install one piece of memory at a time, if possible, trying the different memory slots.

      5. Replace the suspect memory with a known good memory module. If the memory still fails, the system board memory slot may be defective.

      6. Move the suspect memory to a known good slot, several slots, or another computer. If the memory is still not recognized in known good slots, the memory is probably the cause of the failure.

      7. Use Lenovo Diagostics Software.

      8. Check to make sure the currently installed BIOS is the latest available.

      Note: The initial memory count on some computers may indicate 1MB less than expected. Some machines use at least 1MB of memory for video.

      Need more help?
      Check warranty status and upgrade
      Return to NetVista/ThinkCentre Troubleshooting index


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      • Alias ID: MIGR-52277
      • Document ID: HT080202
      • Last Updated :22 Sep 2014
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