Power-On Error Codes

 When power is first applied to the system, the POST BIOS code checks the
 CPU, Keyboard, and various controllers and when it encounters an error, it
 typically beeps and displays an error code and a brief message.

 The earliest PCs, Xt, and ATs displayed a simple error code number and
 left you wondering what happened.  Later BIOSes provide more info, but
 often use the same numbering convention as shown below.

█▌Beep Codes▐█
  No beeps, no display:        Power failure
  Continuous beeps:            Power failure
  Repeating short beeps:       Power failure
  One short beep:              Display failure
  One long, two short beeps:   Display failure
  One long, three short beeps: EGA display failure

█▌100s: Motherboard▐█
  101     Interrupt failure
  102     Timer failure
  103     Timer interrupt failure
  104     Protected mode failure
  107     Hot non-maskable interrupt (NMI) test
  108     Timer bus test failure
  109     Direct Memory Access (DMA) failure
  110     Motherboard memory
  111     Adapter memory
  112,113,166  Adapter in system unit
  121     Hardware interrupts
  151     Defective battery
  152     Real-time clock
  161     Battery failure
  162,165,199 System options not set correctly; run setup
  163     Time and date not set correctly
  164     Memory size error

█▌200s: Memory▐█
  xxyyy yyzz 201 Bad Chip (note: code IDs chip, but differs for
          various BIOSes, makes, and models
  201,202 Memory test failed
  203,215 Memory address error
  216     Motherboard memory

█▌300s: Keyboard Errors▐█
  301     Improper keyboard response or stuck key
  302     User-indicated error from keyboard test or AT keylock locked
  303     Keyboard or system
  341     Replace keyboard
  342     Replace interface cable
  343     replace enhancement card or cable

█▌400s: Monochrome Monitor▐█
  401     MDA video memory, horizontal sync, or video test failed
  408,416,424  User-indicated display attributes failure
  432     Parallel port test failed

█▌500s: Color Monitor▐█
  501     Video memory, horizontal sync, or video test failed
  408,516,424,532,540,548  User-indicated attribute or mode failure

█▌600s: Diskette Drive▐█
  601     Diskette power-on diagnostics failed
  602     Boot record not valid
  603     Diskette size error
  606     Diskette verify
  607     Write protected
  608     Bad command diskette status
  610     Diskette initialization
  611     Time out
  612     Bad controller
  613,614 Direct memory access (DMA)
  621     Bad seek
  622     Bad cyclic redundancy (CRC)
  623     Record not found
  624     Bad address mark
  625     Bad controller seek
  626     Diskette data compare
  627     Diskette change line
  628     Diskette removed

█▌600s: Math Coprocessor▐█
  701     Coprocessor test failed

█▌900s: Parallel Printer Adapter LPT1▐█
  901     Parallel printer adapter failure

█▌1000s: Parallel Printer Adapter LPT2▐█
  1001    Alternate Parallel printer adapter failure

█▌1400s: Printer▐█
  1401    Printer test failed
  1404    Dot Matrix printer test failed

█▌1700s: Hard Disk▐█
  1702    Time out error
  1703    Seek error
  1704    Disk adapter error
  1705    No record found
  1706    Write fault error
  1707    Track 0 error
  1708    Head select error
  1709    Defective error check
  1710    Read buffer overrun
  1711    Bad address mark
  1712    Undetermined error
  1713    Data compare error
  1714    Drive not ready
  1780,1790 Disk 1 failure or error
  1781,1791 Disk 2 failure or error
  1782    Disk adapter error

See Also: POST
          DOS Error Codes