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