Beep Code | Post Code | Description |
| What to Check (Recommended) |
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9Ah | Shadow for option ROMs. | • Check the expansion cards. | ||
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| • Check the system memory. | |
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| • | Check the main board. |
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9Ch | Set up Power | • Check the main board. | ||
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| Management. |
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9Eh | Enable hardware | • | Treat as an expansion card problem. | |
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| interrupts. | • | Check the main board. |
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A0h | Set time of day. | • | Check the main board. | |
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A2h | Check key lock. | • | Unlock the key lock if it is locked. | |
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| • | Investigate possible problem with the |
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| key lock switch. If it is either unlocked |
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| already or not present on the system |
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| case. |
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| • | Check the main board. |
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A8h | Erase F2 prompt. | • | Check the video card. | |
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| • | Check the main board. |
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AAh | Scan for F2 key stroke. | • | Check the main board. | |
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ACh | Enter SETUP. | • Check the main board. | ||
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AEh | Clear | • | Check the main board. | |
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B0h | Check for errors. | • | Check the main board. | |
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B2h | POST done - prepare to | • Check the main board. | ||
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| boot operating system. |
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B4h | One beep. | • Check the main board. | ||
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B6h | Check password | • Check the main board. | ||
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| (optional). |
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B8h | Clear global descriptor | • | Check the main board. | |
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| table. |
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BCh | Clear parity checkers. | • | Check the main board. | |
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BEh | Clear screen (optional). | • | Check the video card. | |
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| • | Check the main board. |
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BFh | Check virus and backup | • Check the main board. | ||
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| reminders. |
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C0H | Try to boot with INT 19. | • | Check the HDD. | |
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| • | Check the floppy disk drive(s). |
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| • | Check the main board. |
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D0H | Interrupt handler error. | • | Treat as an expansion card problem. | |
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| • | Check the main board. |
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D2h | Unknown interrupt. | • | Treat as an expansion card problem. | |
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| • | Check the main board. |
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D4h | Pending interrupt error. | • | Treat as an expansion card problem. | |
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| • | Check the main board. |
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D6h | Initialize option ROM error. | • | Check the main board. | |
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D8h | Shutdown error. | • | Check the main board. | |
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DAh | Extended Block Move. | • Check the main board. | ||
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DCh | Shutdown error. | • | Check the main board. | |
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86 | Chapter 4 |