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A beep code is an error diagnostic used by most PC-compatible system boards to indicate a hardware problem that prevents completing the POST check. Some beep codes are presumably built into the hardware (for use in case of failure prior to running the BIOS code), but most are defined by the BIOS.
- Gigabyte Technology: page currently includes a list of beep codes used by Gigabyte-branded system boards
- Wikipedia redirects to an article about POST, which does include a reference for standard beep codes
- HP and Compaq Desktop PCs - BIOS Beep Codes