| Beep
Code |
Error |
Probable
Causes |
| 1-1-3 |
NVRAM write/read failure |
Defective
system board |
| 1-1-4 |
BIOS checksum failure |
Faulty
BIOS or defective system board |
| 1-2-1 |
Programmable interval-timer
failure |
Defective
system board |
| 1-2-2 |
DMA initialization failure |
Defective
system board |
| 1-2-3 |
DMA page register write/read
failure |
Defective
system board |
| 1-3-1 |
Main-memory refresh verification
failure |
Faulty
or improperly seated DIMM or defective system board |
| 1-3-2 |
No
memory installed |
No memory
installed, or faulty or improperly seated DIMM |
| 1-3-3 |
Chip or data line failure in the
first 64 KB of main memory |
Faulty
or improperly seated DIMM |
| 1-3-4 |
Odd/even logic failure in the
first 64 KB of main memory |
Faulty
or improperly seated DIMM |
| 1-4-1 |
Address line failure in the first
64 KB of main memory |
Faulty
or improperly seated DIMM |
| 1-4-2 |
Parity failure in the first 64 KB
of main memory |
Faulty or improperly seated DIMM or address line failure in the first 64 KB of RAM (System riser cards may cause this error. Remove the riser card and retest) |
| 2-1-1
through 2-4-4 |
Bit failure in the first 64 KB of
main memory |
Faulty
or improperly seated DIMM |
| 3-1-1 |
Slave DMA-register failure |
Defective
system board |
| 3-1-2 |
Master DMA-register failure |
Defective
system board |
| 3-1-3 |
Master interrupt-mask register
failure |
Defective
system board |
| 3-1-4 |
Slave interrupt-mask register
failure |
Defective
system board |
| 3-2-4 |
Keyboard-controller test failure |
Faulty
keyboard controller (defective system board) |
| 3-3-4 |
Screen initialization failure |
Faulty
video subsystem (defective system board) |
| 3-4-1 |
Screen-retrace test failure |
Faulty
video subsystem (defective system board) |
| 3-4-2 |
Search for video ROM failed |
Faulty
video subsystem (defective system board) |
| 4-2-1 |
No timer tick |
Defective
system board |
| 4-2-2 |
Shutdown failure |
Defective
system board |
| 4-2-3 |
Gate A20 failure |
Defective
system board |
| 4-2-4 |
Unexpected interrupt in protected
mode |
Defective
system board |
| 4-3-1 |
Memory failure above address
0FFFFh |
Faulty
or improperly seated DIMM |
| 4-3-3 |
Timer-chip counter 2 failure |
Defective
system board |
| 4-3-4 |
Time-of-day clock stopped |
Bad
battery or defective system board |
| 4-4-1 |
Serial-port test failure |
Faulty
I/O chip (defective system board) |
| 4-4-2 |
Parallel-port test failure |
Faulty
I/O chip (defective system board) |
| 4-4-3 |
Math coprocessor failure |
Faulty
microprocessor chip or system board |
| 4-4-4 |
Cache test failure |
Defective
microprocessor or system board |
