| Beep State | Meaning |
| 1 long beep followed by 2 short beeps | Video configuration failure (a faulty video card or no card installed), or an external ROM module does not properly checksum to zero. |
| 1 | Refresh failure |
| 2 | Parity can't be reset |
| 3 | First 64K memory failure |
| 4 | Timer not operational |
| 5 | Processor failure (reserved; not used) |
| 6 | 8042 GateA20 can't be toggled (memory failure or not present) |
| 7 | Exception interrupt error |
| 8 | Display memory R/W error |
| 9 | (Reserved; not used) |
| 10 | CMOS Shutdown register test error |
| 11 | Invalid BIOS (such as, POST module not found) |