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On startup, computers perform a Power-on Self Test, commonly referred to as a POST. If problems are found while booting, you can usually diagnose them using the error codes displayed on the screen. However, if nothing displays on the screen, the computer might use sounds (that is, beep codes) to tell you what is wrong. Many of these errors indicate hardware problems that a service technician should fix. However, some errors are easily fixed. For example, keyboard controller errors often mean that your keyboard isn't plugged in.

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Following are beep codes for some common brands of BIOS for PCs. For information about Mac beep codes or startup tones, see Apple Support's About Mac computer startup tones.

Many BIOSes will have different beep codes even if they appear to be from the same manufacturer. This is because motherboard manufacturers reprogram codes to reflect their own customizations. You can often go to the website for the motherboard's manufacturer to find the updated codes, but you may find cases where the manufacturer simply does not document the changes.

For more about beeps and error codes, see's Computer POST and beepcodes.



Award BIOSes typically use more screen errors than beep codes.

For Award BIOSes manufactured by Phoenix Technologies, note the following from the Phoenix Technologies AwardBIOS Error Messages page:

'The only AwardBIOS beep code indicates that a video error has occurred and the BIOS cannot initialize the video screen to display any additional information. This beep code consists of a single long beep followed by two short beeps. Any other beeps are probably RAM (Random Access Memory) problems.'

Award BIOSes not manufactured under Phoenix Technologies use the following beeps; this information is from the BIOS Central Award BIOS Beep Codes page:

Beeps Meaning
1 long, 2 short
Video adapter error: Bad or improperly seated video card
Repeating beeps
1 long, 3 short
Bad video RAM or video card not present
High-frequency beeps Overheated CPU: Check fans
Repeating high/low beeps

AMI (American Megatrends)

The information below is from the BIOS Central AMI BIOS Beep Codes page.

Beeps Meaning
1 short DRAM refresh failure
2 short
Parity circuit failure in the first 64 KB of RAM: Likely a bad RAM IC, or possibly one of the hardware tests has failed
3 short
Memory failure in the first 64 KB of RAM: Likely a bad RAM IC
4 short
System timer failure: Bad clock IC or bad RAM in the first bank of memory
5 short
6 short
Keyboard controller Gate A20 error: The keyboard controller has failed. Due to its integration into the system board, you usually must replace the motherboard.
7 short
Virtual mode exception error: CPU has generated an exception error; bad CPU or motherboard
8 short
Display memory Read/Write test failure: Bad video card
9 short
10 short
CMOS shutdown Read/Write error
11 short
Cache Memory error: Specifically, the L2 cache is bad.
1 long, 2 short
Video system failure: Error in video card BIOS, or a horizontal retrace has failed
1 long, 3 short
1 long, 8 short
Display/Retrace test failed: Video adapter is defective or missing


The following information is from the BIOS Central AST BIOS Beep Codes page.

Beeps Meaning
1 short
2 short
Keyboard controller buffer failure: The keyboard controller has failed.
3 short
Keyboard controller reset failure: The keyboard controller has failed or the motherboard circuitry is faulty.
4 short
Keyboard communication failure: Bad keyboard controller or keyboard
5 short
Keyboard input failure: The keyboard controller IC has failed.
6 short
System board chipset failure: The chipset on the motherboard has failed. Replace the motherboard.
9 short
BIOS ROM checksum error: The BIOS ROM has failed. If possible, replace the BIOS on the motherboard.
10 short
System timer test failure: The system clock IC has failed.
11 short
ASIC failure: Motherboard circuitry has failed. Replace the motherboard.
12 short
CMOS RAM shutdown register failure: The real-time clock/CMOS IC failed. Replace the CMOS or motherboard.
1 long
DMA controller 0 failure: The DMA controller IC for channel 0 has failed. If possible, replace the IC.
1 long, 1 short
DMA controller 1 failure: The DMA controller IC for channel 1 has failed. If possible, replace the IC.
1 long, 2 short
Video vertical retrace failure: The video adapter has probably failed. Replace the video adapter.
1 long, 3 short
Video memory test failure: The video adapter's memory has failed. Replace the video adapter.
1 long, 4 short
Video adapter failure: The video adapter has failed. Replace the video adapter.
1 long, 5 short
64 KB memory failure: A failure has occurred in the base 64 KB of memory. If possible, replace the RAM IC.
1 long, 6 short
Unable to load interrupt vectors: The BIOS was unable to load the interrupt vectors into memory.
1 long, 7 short
Unable to initialize video: This is a video problem. Replace the video adapter first. If the problem persists, replace the motherboard.
1 long, 8 short
Video memory failure: There is a failure in the video memory. Replace the video adapter first. If the problem persists, replace the motherboard.


The following information is from the BIOS Central Compaq BIOS Beep Codes page.

Beeps Meaning
1 short
1 long, 1 short
BIOS ROM checksum error: The contents of the BIOS ROM do not match the expected contents. If possible, reload the BIOS from the PAQ.
2 short
General error: No specifics available on what this code means
1 long, 2 short
Video error: Check the video adapter and make sure it's seated properly. If possible, replace the video adapter.
7 beeps (1 long, 1 short, 1 long, 1 short, pause, 1 long, 1 short, 1 short)
AGP video: The AGP video card is faulty. Reseat the card or replace it outright. This beep pertains to Compaq Deskpro systems.
Continuous beep
1 short, 2 long
Bad RAM: Reseat RAM, then retest; replace RAM if failure continues.


The following information applies to Phoenix BIOS Q3.07 or 4.x. This information is from the Phoenix BIOS beep codessection of the ComputerPOST and beep codes page.

Dashes indicate pauses between beeps.

Beeps Meaning
1-1-1-3 Verify real mode.
1-1-2-1 Get CPU type.
1-1-2-3 Initialize system hardware.
Initialize chipset registers with initial POST values.
1-1-3-2 Set in POST flag.
1-1-3-3 Initialize CPU registers.
1-1-4-3 Initialize I/O.
1-2-1-1 Initialize Power Management.
Load alternate registers with initial POST values.
1-2-1-3 Jump to UserPatch0.
1-2-2-3 BIOS ROM checksum
1-2-3-1 8254 timer initialization
8237 DMA controller initialization
1-3-1-1Test DRAM refresh.
Test 8742 Keyboard Controller.
1-3-3-128 Autosize DRAM.
1-3-3-3Clear 512 KB base RAM.
Test 512 KB base address lines.
1-3-4-3Test 512 KB base memory.
1-4-1-3Test CPU bus-clock frequency.
1-4-2-4Reinitialize the chipset.
1-4-3-1Shadow system BIOS ROM.
1-4-3-2Reinitialize the cache.
1-4-3-3Autosize cache.
Load alternate registers with CMOS values.
2-1-1-1Set Initial CPU speed.
2-1-1-3Initialize interrupt vectors.
2-1-2-1Initialize BIOS interrupts.
2-1-2-3Check ROM copyright notice.
Check video configuration against CMOS.
Initialize all video adapters in system.
2-1-4-1Shadow video BIOS ROM.
2-1-4-3Display copyright notice.
2-2-1-1Display CPU type and speed.
2-2-1-3Test keyboard.
2-2-2-1Set key click if enabled.
2-2-2-356 Enable keyboard.
Display message 'Press F2 to enter SETUP'.
2-3-1-1Test expanded memory.
Test extended memory address lines.
2-3-2-1Jump to UserPatch1.
Enable external and CPU caches.
2-3-3-3Display external cache size.
2-3-4-1Display shadow message.
2-4-1-1Display error messages.
Check for configuration errors.
2-4-2-1Test real-time clock.
2-4-2-3Check for keyboard errors.
2-4-4-3Test coprocessor if present.
3-1-1-1Disable onboard I/O ports.
Detect and install external RS232 ports.
Re-initialize onboard I/O ports.
3-1-3-1Initialize BIOS Data Area.
3-1-4-1Initialize floppy controller.
Initialize hard-disk controller.
3-2-1-3Jump to UserPatch2.
3-2-2-1Disable A20 address line.
Clear huge ES segment register.
3-2-3-1Search for option ROMs.
3-2-3-3Shadow option ROMs.
3-2-4-1Set up Power Management.
3-2-4-3Enable hardware interrupts.
3-3-1-1Set time of day.
3-3-1-3Check key lock.
3-3-3-1Erase 'F2' message.
3-3-3-3Scan for F2 keystroke.
3-3-4-1Enter SETUP.
3-3-4-3Clear in-POST flag.
3-4-1-1Check for errors.
3-4-2-1One beep.
3-4-2-3Check password (optional).
Clear global descriptor table.
3-4-4-1Clear parity checkers.
3-4-4-3Clear screen (optional).
4-1-1-1Try to boot with INT 19.
4-2-1-1Interrupt handler error.
4-2-1-3Unknown interrupt error.
4-2-2-1Pending interrupt error.
4-2-2-3Initialize option ROM error.
4-2-3-1Shutdown error.
4-2-3-3Extended Block Move.
4-2-4-1Shutdown 10 error.
4-3-1-3Initialize the chipset.
4-3-1-4Initialize refresh counter.
4-3-2-1Check for Forced Flash.
4-3-2-2Check HW status of ROM.
4-3-2-3BIOS ROM is okay.
4-3-2-4Do a complete RAM test.
4-3-3-1Do OEM initialization.
Initialize interrupt controller.
4-3-3-3Read in bootstrap code.
4-3-3-4Initialize all vectors.
4-3-4-1Boot the Flash program.
4-3-4-2Initialize the boot device.
4-3-4-3Boot code was read okay.

IBM Desktop

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Beeps Meaning
No beep
No power, loose expansion card (ISA, PCI, or AGP), a short, or an improperly grounded motherboard
1 short System okay
1 long
Video/display problem; video card incorrectly seated or defective
2 short
3 long
Problem with 3270 keyboard card
1 long, 1 short Problem with system board
1 long, 2 short
1 long, 3 short Problem with EGA
Repeating short beeps
Problem with power supply or system board
Continuous beep

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IBM ThinkPad

Beeps Meaning
Continuous beeping System board failure
1 beep with blank display
LCD connector problem, LCD backlight inverter failure, video adapter failure, or LCD assembly failure
Boot device failure or bad system board
1 long, 2 short
System board, video adapter, or LCD assembly failure
1 long, 4 short Low battery voltage
1 beep every second Low battery voltage
2 short w/message
2 short with blank display System board failure


Beeps Meaning
1 Normal boot: No problems
Video adapter error: Video adapter is not seated or is faulty
Keyboard controller error: Keyboard controller IC bad
Keyboard error: Keyboard itself might be bad, or the controller IC on the motherboard
PIC 0 error: The programmable interrupt controller IC is bad
6 PIC 1 error: Same as above
DMA page register error: DMA controller IC is bad
8 RAM refresh error
9 RAM data error
10 RAM parity error
DMA controller 0 error: DMA controller IC for channel 0 has failed
12 CMOS RAM error: Bad CMOS RAM
DMA controller 1 error: DMA controller IC for channel 1 has failed
CMOS RAM battery error: Dead CMOS battery; can usually be replaced
BIOS ROM checksum error: BIOS RAM failed
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Quadtel BIOS

The following information is from the BIOS Central Quadtel BIOS Beep Codes page.

1 short
2 short
CMOS IC error: The CMOS RAM is faulty. Replace the IC if possible.
1 long, 2 short
Video failure: The video adapter is faulty. Reseat the video adapter or replace the adapter if possible.
1 long, 3 short
Peripheral controller error: One or more of the system peripheral controllers is bad. Replace the controllers and retest.
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