BIOS sounds
IBM BIOS
| Audible Alarms | Errors |
| 1 short | Computer is running and ready to run |
| 1 signal and blank screen | Video system defective |
| 2 short | Video system defective (monitor not connected) |
| 3 long | Defective motherboard (keyboard controller error) |
| 1 long, 1 short | The motherboard is defective |
| 1 long, 2 short | Video system defective (Mono / CGA) |
| 1 long, 3 short | Video system defective (EGA / VGA) |
| Duplicate short | Trouble associated with power supply or motherboard |
| Continuous | Problems with power supply or motherboard |
| Missing | The power supply unit, motherboard, or speaker is defective |
Award BIOS
| Audible Alarms | Errors |
| 1 short | Computer is running and ready to run |
| 2 short | Minor errors detected Minor errors appear on the screen of the monitor. Enter the CMOS Setup Utility program and correct the situation. Check the looseness of the loops in the hard disk and motherboard connectors |
| 3 long | Keyboard controller error |
| 1 short, 1 long | RAM error |
| 1 long, 2 short | Video card error |
| 1 long, 3 short | Video memory error |
| 1 long, 9 short | Read error from ROM (read-only memory) |
| Repeating short | Power supply problems Problems with RAM |
| Repeating long | Problems with RAM |
| Repetitive high-low frequency | Problems with |
| Continuous | Problems with power supply |
AMI BIOS
| Audible Alarms | Errors |
| 1 short | Computer is running and ready to run |
| 1 long, 1 short | Power supply problems |
| 1 long, 4 short | No Video Card |
| 2 short | Parity error or you forgot to turn off the scanner or printer |
| 3 short | Error in the first 64 KB of RAM |
| 4 short | System timer failure |
| 5 short | Problems with the processor |
| 6 short | Keyboard controller initialization error |
| 7 short | Problems with the motherboard |
| 8 short | Memory card error |
| 9 shorts | The checksum of the BIOS is incorrect |
| 10 short | Error writing to CMOS |
| 11 short | Error located on the system |
| 1 long, 2 short | Graphics card error (Mono-CGA) |
| 1 long, 3 short | Video card error (EGA-VGA) |
| 1 long, 8 short | Problems with video card or monitor not connected |
| Missing and blank screen | The processor is faulty. The contact of the chip may be bent. If it does not work, replace the processor. |
| Continuous sound signal | Power supply failure or computer overheating |
AST BIOS
| Audible Alarms | Errors |
| 1 short | Error checking CPU registers. CPU Malfunction |
| 2 short | Keyboard controller buffer error. Keyboard controller malfunction |
| 3 short | Keyboard controller reset error. Faulty keyboard controller or motherboard |
| 4 short | Connection error with keyboard |
| 5 short | Keyboard input error |
| 6 short | System board error |
| 9 shorts | A mismatch of the ROM checksum. Faulty BIOS chip BIOS |
| 10 short | System timer error. The system clock chip is faulty |
| 11 short | Chipset error |
| 12 shorts | Error of power management register in non-volatile memory |
| 1 long | DMA controller 0 channel controller error |
| 1 long, 1 short | DMA controller channel 1 error |
| 1 long, 2 short | Error of retraction of the reverse stroke of a vertical scan. The video adapter may be defective |
| 1 long, 3 short | The video memory error. The video adapter's memory is faulty |
| 1 long, 4 short | Video adapter error. Defective video adapter |
| 1 long, 5 short | Memory error 64K |
| 1 long, 6 short | Failed to load interrupt vectors. BIOS could not load interrupt vectors into memory |
| 1 long, 7 short | Failed to initialize video equipment |
| 1 long, 8 short | Video memory error |
