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Beep Codes

Basic Troubleshooting Steps Beep Codes
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AMI Beep Codes

BeepsError message
1 shortSystem RAM refresh failure
2 shortMemory parity error
3 shortBase 64-kbytes memory failure
4 shortSystem timer failure
5 shortCPU failure
6 shortGate A20 failure
7 shortException error
8 shortVideo memory read/write error
9 shortROM checksum error
10 shortCMOS shutdown register read/write error
1 long - 3 shortMemory test failure
1 long - 8 shortDisplay test failure

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Phoenix Beep and Post Codes for PhoenixBIOS 4.x

BeepsPOSTError message
1-1-1-302Verify Real Mode
1-1-2-104Get CPU type
1-1-2-306Initialize system hardware
1-1-3-108Initialize chipset registers with initial POST values
1-1-3-209Set in POST flag
1-1-3-30AInitialize CPU registers
1-1-4-10CInitialize cache to initial POST values
1-1-4-30EInitialize I/O
1-2-1-110Initialize Power Management
1-2-1-211Load alternate registers with initial POST values
1-2-1-312Jump to UserPatch0
1-2-2-114Initialize keyboard controller
1-2-2-316BIOS ROM checksum
1-2-3-1188254 timer initialization
1-2-3-31A8237 DMA controller initialization
1-2-4-11CReset Programmable Interrupt Controller
1-3-1-120Test DRAM refresh
1-3-1-322Test 8742 Keyboard Conroller
1-3-2-124Set ES segment to register to 4 GB
1-3-3-128Autosize DRAM
1-3-3-32AClear 512K base RAM
1-3-4-12CTest 512 base address lines
1-3-4-32ETest 512K base memory
1-4-1-332Test CPU bus-clock frequency
1-4-2-437Reinitialize the chipset
1-4-3-138Shadow system BIOS ROM
1-4-3-239Reinitialize the cache
1-4-3-33AAutosize cache
1-4-4-13CConfigure advanced chipset registers
1-4-4-23DLoad alternate registers with CMOS values
2-1-1-140Set Initial CPU speed
2-1-1-342Initialize interrupt vectors
2-1-2-144Intialize BIOS interrrupts
2-1-2-346Check ROM copyright notice
2-1-2-447Initialize manager for PCI Options ROMs
2-1-3-148Check video configuration against CMOS
2-1-3-249Initialize PCI bus and devices
2-1-3-34AInitialize all video adapters in system
2-1-4-14CShadow video BIOS ROM
2-1-4-34EDisplay copyright notice
2-2-1-150Display CPU type and speed
2-2-1-352Test keyboard
2-2-2-154Set key click if enabled
2-2-2-356Enable keyboard
2-2-3-158Test for unexpected interrupts
2-2-3-35ADisplay prompt "Press F2 to enter SETUP"
2-2-4-15CTest RAM between 512 and 640k
2-3-1-160Test expanded memory
2-3-1-362Test extended memory address lines
2-3-2-164Jump to UserPatch1
2-3-2-366Configure advanced cache registers
2-3-3-168Enable external and CPU caches
2-3-3-36ADisplay external cache size
2-3-4-16CDisplay shadow message
2-3-4-36EDisplay non-disposable segments
2-4-1-170Display error messages
2-4-1-372Check for configuration errors
2-4-2-174Test real-time clock
2-4-2-376Check for keyboard errors
2-4-4-17CSet up hardware interrupts vectors
2-4-4-37ETest coprocessor if present
3-1-1-180Disable onboard I/O ports
3-1-1-382Detect and install external RS232 ports
3-1-2-184Detect and install external parallel ports
3-1-2-386Re-initialize onboard I/O ports
3-1-3-188Initialize BIOS Data Area
3-1-3-38AInitialize Extended BIOS Data Area
3-1-4-18CInitialize floppy controller
3-2-1-190Initialize hard-disk controller
3-2-1-291Initialize local-bus hard-disk controller
3-2-1-392Jump to UserPatch2
3-2-2-194Disable A20 adress line
3-2-2-396Clear huge ES segment register
3-2-3-198Search for option ROMs
3-2-3-39AShadow option ROMs
3-2-4-19CSet up Power Management
3-2-4-39EEnable hardware interrupts
3-3-1-1A0Set time of day
3-3-1-3A2Check key lock
3-3-3-1A8Erase F2 prompt
3-3-3-3AAScan for F2 key stroke
3-3-4-1ACEnter SETUP
3-3-4-3AEClear in-POST flag
3-4-1-1B0Check for errors
3-4-1-3B2POST done--prepare to boot operating system
3-4-2-1B4One beep
3-4-2-3B6Check password (optional)
3-4-3-1B8Clear global descriptor table
3-4-4-1BCClear parity checkers
3-4-4-3BEClear screen (optional)
3-4-4-4BFCheck virus and backup reminders
4-1-1-1C0Try to boot with INT 19
4-2-1-1D0Interrupt handler error
4-2-1-3D2Unknown interrupt error
4-2-2-1D4Pending interrupt error
4-2-2-3D6Initialize option ROM error
4-2-3-1D8Shutdown error
4-2-3-3DAExtended Block Move
4-2-4-1DCShutdown 10 error
4-3-1-3E2Initialize the chipset
4-3-1-4E3Initialize refresh counter
4-3-2-1E4Check for Forced Flash
4-3-2-2E5Check HW status of ROM
4-3-2-3E6BIOS ROM is OK
4-3-2-4E7Do a complete RAM test
4-3-3-1E8Do OEM initialization
4-3-3-2E9Initialize interrupt controller
4-3-3-3EARead in bootstrap code
4-3-3-4EBInitialize all vectors
4-3-4-1ECBoot the Flash program
4-3-4-2EDInitialize the boot device
4-3-4-3EEBoot code was read OK

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Phoenix Beep Codes for ISA/MCA/EISA BIOS

BeepsError message
1-1-2CPU register test failure
Low 1-1-2System board select failure
1-1-3CMOS read/write failure
Low 1-1-3Extended CMOS RAM failure
1-1-4BIOS ROM checksum error
1-2-1Programmable interval timer (PIT) failure
1-2-2DMA initialization failure
1-2-3DMA page register read/write failure
1-3-1RAM refresh failure
1-3-264-kbyte RAM test disabled
1-3-3First 64-kbytes RAM IC or data line failure
1-3-4First 64-kbytes odd/even logic failure
1-4-1Address line failure, 64 kbytes of RAM
1-4-2Parity failure, first 64 kbytes of RAM
1-4-3EISA failsafe timer test fault
1-4-4EISA NMI port 462 test failure
2-1-1Bit 0 first 64 kbytes RAM failure
2-1-2Bit 1 first 64 kbytes RAM failure
2-1-3Bit 2 first 64 kbytes RAM failure
2-1-4Bit 3 first 64 kbytes RAM failure
2-2-1Bit 4 first 64 kbytes RAM failure
2-2-2Bit 5 first 64 kbytes RAM failure
2-2-3Bit 6 first 64 kbytes RAM failure
2-2-4Bit 7 first 64 kbytes RAM failure
2-3-1Bit 8 first 64 kbytes RAM failure
2-3-2Bit 9 first 64 kbytes RAM failure
2-3-3Bit 10 first 64 kbytes RAM failure
2-3-4Bit 11 first 64 kbytes RAM failure
2-4-1Bit 12 first 64 kbytes RAM failure
2-4-2Bit 13 first 64 kbytes RAM failure
2-4-3Bit 14 first 64 kbytes RAM failure
2-4-4Bit 15 first 64 kbytes RAM failure
3-1-1Slave DMA register failure
3-1-2Master DMA register failure
3-1-3Master interrupt mask register failure
3-1-4Slave interrupt mask register failure
3-2-2Interrupt vector loading error
3-2-3Reserved
3-2-4Keyboard controller test failure
3-3-1CMOS RAM power bad
3-3-2CMOS configuration error
3-3-3Reserved
3-3-4Video memory test failed
3-4-1Video initialization test failure
4-2-1Timer tick failure
4-2-2Shutdown test failure
4-2-3Gate A20 failure
4-2-4Unexpected interrupt in protected mode
4-3-1RAM test address failure
4-3-3Interval timer channel 2 failure
4-3-4Time-of-day clock failure
4-4-1Serial-port test failure
4-4-2Parallel-port test failure
4-4-3Math coprocessor failure

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AST Beep Codes

BeepsError message
1 shortCPU register test failure
2 shortKeyboard controller buffer failure
3 shortKeyboard controller reset failure
4 shortKeyboard communication failure
5 shortKeyboard input port failure
6 shortSystem board chipset initialization failure
9 shortBIOS ROM checksum error
10 shortSystem timer test failure
11 shortASIC register test failure
12 shortCMOS RAM shutdown register failure
1 longDMA controller 0 failure
1 long - 1 shortDMA controller 1 failure
1 long - 2 shortVideo vertical retrace failure
1 long - 3 shortVideo memory test failure
1 long - 4 shortVideo adapter test failure
1 long - 5 short64 kbytes base memory failure
1 long - 6 shortUnable to load interrupt vectors
1 long - 7 shortUnable to initialize video system
1 long - 8 shortVideo memory failure

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Compaq Beep Codes

BeepsError message
1 shortNo error
1 long - 1 shortBIOS ROM checksum error
2 shortGeneral error
1 long - 2 shortVideo adapter error

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IBM Beep Codes

BeepsError message
l shortStart of test
2 shortInitialization error
1 long - 1 shortSystem board error
1 long - 2 shortVideo adapter error
1 long - 3 shortEGA/VGA adapter error
3 longKeyboard adapter error
999 shortPower supply or system board error
NonePower supply or system board error

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Quadtel Beep Codes

BeepsError message
1 shortStart of test
2 shortCMOS IC error
1 long - 2 shortVideo controller error
1 long > 2 shortPeripheral controller error

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Mr. BIOS Beep Codes

BeepsError message
low high, low low lowROM BIOS Checksum Test
low high, high low lowPage Register Test (Ports 81-8F)
low high, low high low8042 Keyboard Controller Selftest
low high, high high lowMemory Refresh Circuit Test
low high, low low highMaster (16bit) DMA Controller Failure
low high, high low highSlave (8 bit) DMA Controller Failure
low high, low low low lowMemory Bank 0 Pattern Test Failure
low high, high low low lowMemory Bank 0 Parity Circuitry Failure
low high, low high low lowMemory Bank 0 Parity Error
low high, high high low lowMemory Bank 0 Data Bus Failure
low high, low low high lowMemory Bank 0 Address Bus Failure
low high, high low high lowMemory Bank 0 Block Access Read Failure
low high, low high high lowMemory Bank 0 Block Access Read/Write Failure
low high, high high high lowMaster 8259 (Port 21 ) Failure
low high, low low low highSlave 8259 (Port A1) Failure
low high, high low low highMaster 8259 (Port 20) Interrupt Address Error
low high, low high low highSlave 8259 (Port A0) Interrupt Address Error
low high, high high low low8259 (Port 20/A0) Interrupt Address Error
low high, low low high highMaster 8259 (Port 20) Stuck Intercept Error
low high, high low high highSlave 8259 (Port A0) Stuck Intercept Error
low high, low high high highSystem Timer 8254 CH0/IRQ0 Interrupt Failure
low high, high high high high8254 Channel 0 Test and Initialization
low high, low low low low high8254 Channel-2 (Speaker) Failure
low high, high low low low high8254 OUT2 (Speaker Detect) Failure
low high, low high low low highCMOS RAM Read/Write Test Failure
low high, high high low low highRTC Periodic Interrupt / IRQ8 Failure
low high, low low high low highVideo Initialization and (Cold-Boot) Sign on Message
low high, high low high low highKeyboard Controller Failure
low high, low low low high highA20 Test Failure Due to 8042 Timeout
low high, high low low high highA20 Gate Stuck in Disabled State
low high, low high high low high Memory Parity Error
low high, high high high low highIO Channel Error
low high, low high low high highReal Time Clock is Not Updating

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Mylex and Eurosoft Beep Codes

BeepsError message
1Start of test
2Video adapter error
3Keyboard controller error
4Keyboard error
5PIC 0 error
6PIC 1 error
7DMA page register error
8RAM refresh error
9RAM data error
10RAM parity error
11DMA controller 0 error
12CMOS RAM error
13DMA controller 1 error
14CMOS RAM battery error
15CMOS RAM checksum error
16BIOS ROM checksum error

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Mylex 386 Beep Codes

BeepsError message
1 longStart of test
2 longVideo adapter fault (or adapter missing)
1 long - 1 short - 1 longKeyboard controller error
1 long - 2 short - 1 longKeyboard error
1 long - 3 short - 1 longPIC 0 error
1 long - 4 short - 1 longPIC 1 error
1 long - 5 short - 1 longDMA page register error
1 long - 6 short - 1 longRAM refresh error
1 long - 7 short - 1 longRAM data test error
1 long - 8 short - 1 longRAM parity error
1 long - 9 short - 1 longDAM controller 1 error
1 long - 10 short - 1 longCMOS RAM failure
1 long - 11 short - 1 longDMA controller 2 error
1 long - 12 short - 1 longCMOS RAM battery failure
1 long - 13 short - 1 longCMOS checksum failure
1 long - 14 short - 1 longBIOS ROM checksum failure
>1 longMultiple faults detected

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Tandon Beep Codes

BeepsError message
long - short - long - short8524 counter timer failure
short - long - shortRAM refresh failure
long - long - longSystem RAM failure
short - short - shortBIOS RAM checksum failure
long - longNo video adapter is installed
long - long - long - longVideo adapter failure


  • Phoenix and Award Bios - Find more specs on these Bios
  • Bios Central - Bios Central is a site to aid users in the troubleshooting, setup, and questions about the computer BIOS and general system troubleshooting


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