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BIOS POST Beep Codes
The table below lists the POST error beep codes. Prior to system video initialization, the BIOS uses these beep codes to inform users of error conditions. The beep code occurs only when a critical error occurs or when the BIOS fails to boot to the operating system. Please note that
not all error conditions are supported by BIOS beep codes.
Number of Beeps | Description |
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1 | Refresh failure |
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2 | Parity cannot be reset |
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3 | First 64 Kb memory failure |
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4 | Timer not operational |
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5 | Processor failure (Reserved; not used) |
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6 | 8042 GateA20 cannot be toggled (memory failure or |
| not present) |
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7 | Exception interrupt error |
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8 | Display memory R/W error |
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9 | (Reserved; not used) |
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10 | CMOS Shutdown register test error |
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11 | Invalid BIOS (such as, POST module not found) |
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