Each BIOS manufacturer has its own diagnostic codes that identify specific POST errors. You need to consult the BIOS documentation for the diagnostic codes for your BIOS, but the general breakdown of the code categories is as follows:

  • 100–199: Motherboard error

  • 200–299: Memory error

  • 300–399: Keyboard error

  • 600–699: Floppy drive error

  • 1400–1499: Printer error

  • 1700–1799: Hard drive error