POST Error Beep Codes for Intel® Server Boards and Intel® Server Systems


Install & Setup



Note To obtain more information on beep code resolutions, refer to POST Code Diagnostics for the Intel® Server Board and Intel® Server System Product Families. On this page, the Interactive POST Code Diagnostics Decoder tool is intended to assist you in troubleshooting a system hang during a system's Power-On Self-Test (POST) process.

Prior to system video initialization, the BIOS uses beep codes to inform you about error conditions. The beep code is followed by a user-visible code displayed on the Diagnostic LEDs.

For more information regarding POST codes, refer to the sections specific to POST Codes in the Service Guide for your product:

Note Common supported codes are listed in these tables. For more platform-specific beep codes and POST Progress codes, refer to the Service and Setup Guide or Technical Product Specification (TPS) for your product. DIMM installation rules are also covered in the TPS.


What are some common beep codes I should be aware of?



Error Message


1 short

USB device action

Short beep sounded whenever USB device is discovered in POST, or inserted or removed during runtime.

1 long

Intel® Trusted Execution Technology (Intel® TXT) security violation

System halted because Intel® TXT detected a potential violation of system security.

3 short

Memory error

System halted because a fatal error related to the memory was detected.
3 long and 1 short1 CPU mismatch error System halted because a fatal error related to the CPU family/core/cache mismatch was detected.
2 short Recovery started BIOS Recovery boot has been initiated.
4 short Recovery failed BIOS Recovery has failed. This failure typically happens so quickly after recovery is initiated that it sounds like a 2-4 beep code.


1 This beep code only applies to the Intel® Server Boards and Intel® Server Systems supporting the Intel® Xeon® Processor E5-2600 v3 product family.

The Integrated BMC generates beep codes when it detects failure conditions. Beep codes are sounded each time the problem is discovered, such as with each power-up attempt, but are not sounded continuously. Each digit in the code represents the number of beeps in the sequence.


What are the beep codes from the Integrated BMC?


Beeps Error Message Description
1-5-2-1 CPU socket population error CPU1 socket is empty, or sockets are populated incorrectly. CPU1 must be populated before CPU2.
1-5-2-4 MSID Mismatch MSID mismatch occurs if a processor is installed into a system board that has incompatible power capabilities.
1-5-4-2 Power fault DC power unexpectedly lost (power good dropout) - Power unit sensors report power unit failure offset.
1-5-4-4 Power control fault Power good assertion timeout - Power unit sensors report soft power control failure offset.
1-5-1-2 VR Watchdog Timer VR controller DC power on sequence not completed in time.
1-5-1-4 Power Supply Status The system does not power on, or unexpectedly powers off. A Power Supply Unit (PSU) is present that is incompatible with one or more other PSUs in the system.
Related topics
Self-help Guides for all Intel® Server Products
Troubleshooting Intel® Server System Boot Issues for Intel® Server Products
Basic Troubleshooting Guide for Intel® RAID Controller–Related Issues
For firmware updates and troubleshooting tips