Why Is There a POST Beep Code 1-5-2-1 and 1-5-4-2 Even Though the Single CPU Is Properly Connected to the CPU1 Socket?
Content Type: Error Messages | Article ID: 000055256 | Last Reviewed: 05/07/2025
Getting 1-5-2-1 and 1-5-4-2 POST Error Beep Codes with single CPU
In S2600ST family both the CPU sockets, CPU1 and CPU2, need to have 12V power connection, even if only the CPU1 socket is populated. This is because the BMC monitors the presence of power signals in the server board in order for the board to boot
For more details, refer to the CPU Power Connectors section in the Technical Product Specifications (Technical Product Specification for the Intel® Server Board S2600ST Family). Additional information on the POST beep codes can also be found in Appendix C.