The BIOS uses a series of beeps on the internal speaker to alert the user to problems during the startup process. In the following table, numbers indicate beeps; dashes indicate a pause between beeps.
If POST completes normally, the BIOS issues one short beep before passing control to the operating system.
| Beep Code |
Description |
| 1-1-1 |
Memory not supported (Not RDRAM) |
| 1-1-2 |
Memory not supported (SPD contains invalid width – not 16 or 18) |
| 1-1-3 |
No memory devices were found on one or both channels. |
| 1-1-4 |
More than 32 device on the channel. |
| 1-1-5 |
Memory failure (number of devices detected does not match SPD data) |
| 1-1-6 |
Memory not supported (FRAS data in SPD is invalid) |
| 1-2-3 |
Memory not supported (Populated memory requires too many time domains) |
| 1-2-4 |
Memory not supported (No valid channel frequency) |
| 1-2-5 |
Memory failure (levelization failure – ran out of time domains) |
| 1-2-6 |
Memory not supported (unsupported memory technology) |
| 1-2-7 |
Memory failure (Continuity module missing or chip set failure) |
| 1-2-8 |
Memory not supported (could not find valid refresh rate) |
| 1-3-1 |
Memory not supported (invalid refresh information in SPD) |
| 1-3-2 |
Memory not supported (tCAC invalid) |
| 1-3-3 |
Memory not supported (does not support enough time domains) |
| 1-3-4 |
Memory not supported (tRCD invalid) |
| 1-3-5 |
Memory not supported (invalid SPD tCLS or tCAS) |
| 1-3-6 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-3-8 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-4-1 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-4-2 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-4-3 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-4-4 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-4-5 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-4-8 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-5-1 |
Memory not supported (invalid number of devices on RIMM) |
| 1-5-3 |
Memory not supported (SPD mismatch between channel A and B) |
| 1-5-5 |
Memory failure (Detected bad chip set configuration) |
| 1-5-6 |
Memory not supported (DIMMs must support ECC) |
| 1-6-1 |
Memory not supported (unsupported memory technology) |
| 1-6-2 |
Memory not supported (unsupported memory technology) |
| 1-6-3 |
Memory not supported (could not find valid CAS Latency) |
| 1-6-5 |
Memory not supported (can not mix registered and non-registered memory) |
| 1-6-6 |
Memory not supported (could not find valid CAS Latency) |
| 1-6-7 |
Memory failure (levelization phase 1) |
| 1-6-8 |
Memory failure (levelization phase 2) |
| 2-1-1 |
AGP Pro Detected, prevent computer from starting |
| 2-1-2 |
FMM Initialization failed – Flash Corruption – BIOS Crisis Recovery required |
| 3-3-3 |
BIOS Recovery – Operation Successful |
| 3-1-1 |
BIOS Recovery – Flash Initialization Failure |
| 3-1-2 |
BIOS Recovery – Flash Update Operation Failed |
| 3-1-3 |
BIOS Recovery – Read file from Floppy Operation Failed |
| 3-1-4 |
BIOS Recovery – Flash Erase Operation Failed |
| 3-1-5 |
BIOS Recovery – Flash Write Operation Failed |
| 3-1-6 |
BIOS Recovery – File Verify Operation (Checksum) Failed |
| 3-1-7 |
BIOS Recovery/Flash Update – Processor Patch Installation Failed |
| 3-2-1 |
BIOS Recovery – File Verify Operation (Invalid BIOS) Failed |
| 3-2-2 |
BIOS Recovery – File Verify Operation (Mismatched Platform BIOS) Failed |
| 3-2-3 |
BIOS Recovery – Boot Block Incompatible with BIOS |
| 3-2-4 |
BIOS Recovery – Flash Verify after Write Failed. |
| 5-1-3 |
SEL_FLASH_GetMaxRecSize had a severe parity error reading flash. |
| 8-1-1 |
The BIOS did not detect a PS/2 or USB keyboard |
| 8-1-2 |
The BIOS did not detect a PS/2 or USB mouse |
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