Computer does not detect all new memory.

Issue

Computer does not detect all new memory.

Cause

This issue could be caused by any of the below reasons.

  1. Memory not setup properly in CMOS.
  2. Computer does not support as much memory as you are attempting to add.
  3. Memory incompatibility.
  4. Bad computer memory.

Solution

Memory not setup properly in CMOS

Verify memory is properly setup and detected within CMOS setup. If the memory is not properly detected in CMOS the rest of the computer will see only what CMOS reports.

Computer does not support as much memory as you are attempting to add

Verify through documentation or through the computer or motherboard manufacturer that that your computer is capable of supporting the amount of memory you are attempting to add. Many computers may not be able to support large amounts of memory exceeding 128, 256 or 512MB of memory.

It is possible that the manufacturer of the computer or motherboard may have a BIOS update, which may also correct issues with the computer detecting more memory or allow the computer to accept more memory.

Memory incompatibility

If the computer is capable of supporting the amount of memory you are attempting to add into the computer, verify the new memory is compatible with the existing memory or that you are installing the correct computer memory.

Because of the possible differences in computer manufactured motherboards, this information must be obtained either through the computer manufacturer or documentation on the computer motherboard.  

Bad computer memory

If the above recommendations have been reviewed and do not apply or did not resolve your issue, it is possible that the computer memory you are attempting to install or the computer motherboard may be bad.