POST Error Codes

If the computer's display cannot display error messages during the POST, the numbers lock (Num Lock), the capitals lock (Caps Lock), and the Scroll Lock indicators display codes that identify the problem or help you identify a faulty component or assembly. The following table lists the error codes that may be generated during POST. Most error codes indicate a fatal error that requires replacement of the system board or other corrective actions before the computer can operate.

NOTE: To display an error code, all three system indicators flash simultaneously (not sequentially). These "flash" codes are the same as the audible "beep" codes used by the Dell Latitude XPi portable computer, for instance.

Table 3-1.

POST Error Codes

Indicator Code

Error

Probable Causes

1-1-3

NVRAM write/read failure

BIOS corrupted; system board faulty

1-1-4

ROM BIOS checksum failure

BIOS corrupted; system board faulty

1-2-1

Programmable interval timer failure

System board faulty

1-2-2

DMA initialization failure

System board faulty

1-2-3

DMA page register write/read failure

System board faulty

1-3-1 through 1-1-1

Installed memory module(s) not being properly identified or used

Memory module improperly seated or system memory controller faulty (system board faulty)

3-1-1

Slave DMA register failure

System board faulty

3-1-2

Master DMA register failure

3-1-3

Master interrupt mask register failure

System board faulty

3-1-4

Slave interrupt mask register failure

3-2-4

Keyboard controller test failure

Keyboard assembly faulty or system board faulty

3-3-4

Display memory test failure

System board faulty

3-4-1

Display initialization failure

3-4-2

Display retrace test failure

4-2-1

No timer tick

System board faulty

4-2-2

Shutdown failure

4-2-3

Gate A20 failure

4-2-4

Unexpected interrupt in protected mode

Indicator Code

Error

Probable Causes

4-3-1

Memory failure above address 0FFFFh

Memory module improperly seated or system memory controller faulty (system board faulty)

4-3-3

Timer chip counter 2 failure

System board faulty

4-3-4

Time-of-day clock stopped

Reserve battery faulty or system board faulty

4-4-1

Serial port failure

System board faulty

5-1-2

No usable memory

Memory module improperly seated or system memory controller faulty (system board faulty)

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