If the monitor cannot display errors or problems, the computer
may emit a series of beeps that identifies the problem. The beep
code indicates the number of beeps that will be emitted. Some
codes consist of 2 sound bursts; for example, 1 beep followed by
3 beeps indicates no monitor connected. The system cannot
complete the boot routine with any of the indicated conditions
except for beep code 8.
| Beep Codes |
Error |
Probable Causes |
| 1* |
Memory refresh failure. |
Defective system board. |
| 2 |
Memory parity error. |
Faulty SIMM or defective system board. |
| 3 |
Memory failure in the first 64 KB of RAM. |
Faulty SIMM. |
| 4 |
Timer failure. |
Faulty SIMM or defective system board. |
| 5 |
Microprocessor error. |
Defective microprocessor. |
| 6 |
Gate A20 failure. |
Defective system board. |
| 7 |
Microprocessor-exception interrupt error. |
Defective microprocessor. |
| 8 |
Video memory read/write error. |
Missing or faulty video adapter. |
| 9 |
ROM checksum error. |
Corrupted system BIOS program or defective system
BIOS chip. |
| 10 |
NVRAM shutdown register
read/write error. |
Defective system board. |
| 11 |
Cache memory error. |
Defective microprocessor. |
| 1-2 |
No video card installed. |
Missing or faulty video adapter. |
| 1-3 |
No monitor connected. |
Disconnected or faulty monitor. |
