Frequently Asked Questions
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Q: What are the POST and boot error messages?

A: The following table is a numerical countdown number of error and status messages which can be generated by the basic input/output system (BIOS) and power-on self-test (POST). Many of the messages refer to the BIOS Setup Utility.

POST
Countdown
Number		 Error
Code		 Message Solution
490   Timer tick interrupt test.  
  490 "490: No time tick interrupt." Run BIOS Setup Utility.
480   Shutdown test.  
  480 Shutdown failure.  
450   Chipset initialization 6.  
440   Size memory above 64KB.  
  440 "440: Gate A20 failure."  
  441 "441: Unexpected interrupt
in protected mode."		 Run BIOS Setup Utility.
430   Interval timer 2 test.  
  430 "430: Timer 2 failure." Run BIOS Setup Utility.
390   Initialize keyboard flags.  
370   "370: Keyboard controller failure." Check the keyboard connection. If
the connection is good, the keyboard
controller may have failed.
  371 "371: Keyboard clock line failure." Check the keyboard connection. If
the connection is good, the keyboard
controller may have failed.
  372 "372: Keyboard data line failure." Check the keyboard connection. If
the connection is good, the keyboard
controller may have failed.
  373 "373: Keyboard stuck failure." Check the keyboard connection. If the
connection is good, check the keys to be
sure one is not stuck.
  374 "374: Keyboard failure." Check the keyboard connection. If the
connection is good, the keyboard might
have failed.
350   Re-initialize keyboard controller.  
330   Initialize auxiliary device.  
310   Initialize keyboard controller
output port.		  
300   Initialize gate A20.  
290   Test memory above 64KB.  
  290 "290: Memory parity failure at
xxxx:0000 to xxxx:FFFF."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  291 "291: Memory data line failure at
xxxx:0000 to xxxx:FFFF."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  292 "292: Memory odd/even logic
failure at xxxx:0000 to xxxx:FFFF."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  293 "293: Memory double word logic
failure at xxxx:0000 to xxxx:FFFF."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  294 "294: Memory high address failure
at xxxx:0000 to xxxx:FFFF."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  295 "295: Memory address line failure at
ssss:yyyy, Read qqqq Expecting zzzz."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  296 "296: Memory write/read failure at
xxxx:yyyy, Read qqqq Expecting zzzz."		 Run BIOS Setup Utility. If SIMMs have been
installed, check to be sure they
are seated properly.
  297 "297: Decreasing available
memory.		 Run BIOS Setup Utility.
270   Initialize extended BIOS
data area.		  
250   Chipset initialization 7.  
230   Enable hardware interrupts.  
210   Read keyboard ID.  
190   Real time clock test.  
  190 "190: Real time clock failure." Run BIOS Setup Utility.
160   Coprocessor test. If coprocessor was installed, check to
be sure it is installed correctly and no
pins are bent.
  160 "160: Coprocessor failure." Run BIOS Setup Utility.
150   Check for invalid configuration.  
140   Chipset initialization 8.  
  140 "140: Shadow of system
BIOS failed."		  
135   Access window into Setup Program. Press F1 to enter BIOS Setup Utility.
130   Initialize disk subsystem.  
  130 "130: Diskette drive failure." Run BIOS Setup Utility Check floppy disk drive
cabling.
  131 "131: Diskette drive 0 failure." Run BIOS Setup Utility Check floppy disk drive
cabling.
  132 "132: Diskette drive 1 failure." Run BIOS Setup Utility Check floppy disk drive
cabling.
120   Initialize hard drive subsystem.  
  120 "120: Hard drive configuration
error."		 Run BIOS Setup Utility. Check hard disk
cabling.
  121 "121: Hard drive controller
failure."		 Run BIOS Setup Utility. Check floppy disk drive
cabling.
  122 "122: Hard drive 0 failure." Run BIOS Setup Utility. Check floppy disk drive
cabling.
  123 "123: Hard drive 1 failure."  
110   Chipset initialization 9.  
100   Set I/O performance for boot.  
808   Initialize option ROM's. Run BIOS Setup Utility.
  080 "080: xxxx0H optional ROM
bad checksum =yyH."		  
  081 "081: Shadow of BIOS at
C0000H-C7FFFH failed."		  
  082 "082: Shadow of BIOS at
C4000H-C7FFFH failed."		  
  083 "083: Shadow of BIOS at
C8000H-CBFFFH failed."		  
  084 "084: Shadow of BIOS at
C0000H-C7FFFH failed."		  
  085 "085: Shadow of BIOS at
D0000H-D3FFFH failed."		  
  086 "086: Shadow of BIOS at
D4000H-D7FFFH failed."		  
  087 "087: Shadow of BIOS at
D8000H-DBFFFH failed."		  
  088 "088: Shadow of BIOS at
DC000H-DFFFFH failed."		  
070   Set system clock.  
  070 "070: Time of day clock not set."  
040   Report configuration errors and
prompt for configuration utility.		 Run BIOS Setup Utility and set the time and day.
  042 Invalid ISA configuration info.  
020   Enable parity checking and NMI.  
010   Enable cache.  
000   Boot.  
  001 "001: Not a bootable disk." Remove the floppy disk from drive A:
Run BIOS Setup Utility.
  002 "002: No bootable device
available."		 Run BIOS Setup Utility.
  003 "003: Hard drive read failure." Run BIOS Setup Utility.
  004 "004: No boot sector on
hard drive."		 Run BIOS Setup Utility.