An introduction to BIOS beep codes

When you power on your computer, the motherboard's basic input/output system (BIOS) first detects the computer's internal hardware configuration and then performs the power-on self-test (POST). The POST executes several diagnostic tests that check the basic functionality of the power supply, motherboard, CPU, I/O Bus Controller, RAM, keyboard, and video components. If the computer passes the POST, it will usually return a single short beep or two short beeps, depending on the BIOS manufacturer. If the POST detects any problems, it will halt the boot process and return an error message either visually on the screen and/or audibly through a series of beeps.

Unfortunately, there is no official standard for beep codes. Depending on the BIOS manufacturer, a keyboard controller failure could be three, four, five, or six beeps. While this document lists common BIOS manufacturer beep codes, you should always consult your motherboard's documentation, the manufacturer's Web site, and the BIOS manufacturer's Web site for a definitive beep code list for your particular BIOS. The information contained in the following lists was gathered from various BIOS manufacturers' Web sites.


AMI BIOS beep codes http://www.ami.com/support/bios.html http://www.ami.com/support/doc/AMIBIOS-codes.pdf
Number of beeps Problem description Troubleshooting recommendation
1 Memory refresh timer error Reseat memory or replace with known good chips.
2 Parity error Reseat memory or replace with known good chips.
3 Base 64K memory read/write test failure Reseat memory or replace with known good chips.
4 Motherboard timer not operational Repair/replace motherboard.
5 Processor error Repair/replace motherboard.
6 8042-gate A20 failure/Keyboard controller BAT test error Reseat keyboard controller chip, replace keyboard controller chip, check for a keyboard fuse, or try a different keyboard.
7 Processor exception interrupt error Repair/replace motherboard.
8 Display memory read/write failure Replace video card or video card memory.
9 ROM checksum error/Faulty BIOS chips Replace chips or motherboard.
10 CMOS shutdown register read/write error Repair/replace motherboard.
11 Cache memory bad Repair/replace motherboard.


AwardBIOS beep codes http://www.phoenix.com/en/Customer+S...rror+Codes.htm
Number of beeps Problem description Troubleshooting recommendation
1 long & 2 short Video error Check the video card.
Any other beeps RAM problem Reseat the RAM or replace with known good chips.


PhoenixBIOS beep codes http://www.phoenix.com/en/Customer+S...efault.htm#Q12 http://www.phoenix.com/NR/rdonlyres/...ospostcode.pdf
Unfortunately, PhoenixBIOS beep codes are significantly more complicated than other BIOS manufacturers. Instead of a single beep code set, PhoenixBIOS codes consist of a series of beep code sets separated by a short pause. Older Phoenix BIOS Plus and PhoenixBIOS 1.x systems used a series of three sets, while the PhoenixBIOS 4.x systems use a series of four sets. The codes listed below are only some of the more than 100 codes for the PhoenixBIOS 4.x. For a complete list of Phoenix BIOS POST task routines and beep codes, please visit their Web site or review your motherboard's documentation.
Number of beeps POST routine description/problem Troubleshooting recommendation
1 One short beep before boot Normal operation
1-1-1-3 Verify real mode A problem exists with the CPU and/or motherboard. Check and replace if necessary.
1-1-2-1 Get CPU type A problem exists with the CPU and/or motherboard. Check and replace if necessary.
1-1-2-3 Initialize system hardware A problem exists with the motherboard. Check and replace if necessary.
1-1-3-1 Initialize chipset with initial POST values A problem exists with the motherboard. Check and replace if necessary.
1-1-3-2 Set IN POST flag A problem exists with the motherboard. Check and replace if necessary.
1-1-3-3 Initialize CPU registers A problem exists with the CPU and/or motherboard. Check and replace if necessary.
1-1-4-3 Initialize I/O component A problem exists with the I/O port hardware or a device connected to an I/O port. It could also be an expansion device in the PC or the motherboard.
1-2-2-1 Initialize keyboard controller An error has occurred with the keyboard or keyboard controller. Try a new keyboard or replace the keyboard controller on the motherboard.
1-2-2-3 BIOS ROM checksum Replace either the BIOS ROM chip or the motherboard.
1-2-3-3 8237 DMA controller initialization Check the motherboard and any expansion cards that use DMA.
1-3-1-1 Test DRAM refresh Check the first bank of memory and the motherboard.
1-3-1-3 Test 8742 keyboard controller An error has occurred with the keyboard or keyboard controller. Try a new keyboard or replace the keyboard controller on the motherboard.
1-3-4-1 RAM failure on line xxxx Check the first bank of memory and the motherboard.
1-3-4-3 RAM failure on data bits xxxx of low byte memory bus Check the first bank of memory and the motherboard.
2-1-3-1 Check video configuration against CMOS Check the video card or video card memory.
2-1-3-2 Initialize PCI bus and devices A problem exists with the I/O port hardware or a device connected to an I/O port. It could also be an expansion device in the PC or the motherboard.
2-2-1-3 Test keyboard An error has occurred with the keyboard or keyboard controller. Try a new keyboard or replace the keyboard controller on the motherboard.
2-2-3-1 Test for unexpected interrupts Check for a faulty motherboard or expansion card.
3-1-2-1 Detect and install external parallel ports A problem exists with the I/O port hardware or a device connected to an I/O port. It could also be an expansion device in the PC or the motherboard.
3-1-4-1 Initialize floppy controller Check your hard drive(s), floppy drive(s), and motherboard.
3-2-1-1 Initialize hard-disk controllers Check your hard drive(s), floppy drive(s), and motherboard.
3-2-1-2 Initialize local-bus hard-disk controllers Check your hard drive(s), floppy drive(s), and motherboard.
3-3-1-1 Set time of day Check the motherboard's real-time clock (RTC).
4-2-4-3 Keyboard controller failure An error has occurred with the keyboard or keyboard controller. Try a new keyboard or replace the keyboard controller on the motherboard.


Dell BIOS beep codes http://support.dell.com/us/en/home.asp
Because Dell uses motherboards and BIOSs from several manufacturers, their computers use a variety of beep codes. Instead of listing each model's beep codes, links are provided to the support pages of several popular Dell desktops.
Model System codes and messages link
Dell Phoenix BIOS http://support.dell.com/support/topi...ent?dn=1032259
Dimension 900 http://support.dell.com/support/edoc...2/codemess.htm
Dimension 2100 http://support.dell.com/support/edoc...0/codemess.htm
Dimension 2200 http://support.dell.com/support/edoc...2200/codes.htm
Dimension 2300 http://support.dell.com/support/edoc...0/advanced.htm
Dimension 2300C http://support.dell.com/support/edoc...c/advanced.htm
Dimension 2350 http://support.dell.com/support/edoc...0/advanced.htm
Dimension 2400 http://support.dell.com/support/edoc...m/advtshoo.htm
Dimension 3000 http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension 4100 http://support.dell.com/support/edoc...l/codemess.htm
Dimension 4200 http://support.dell.com/support/edoc...4200/codes.htm
Dimension 4300 http://support.dell.com/support/edoc...4300/codes.htm
Dimension 4300S http://support.dell.com/support/edoc...300s/codes.htm
Dimension 4400 http://support.dell.com/support/edoc...4400/codes.htm
Dimension 4450 http://support.dell.com/support/edoc...0/advanced.htm
Dimension 4500 http://support.dell.com/support/edoc...0/advanced.htm
Dimension 4500C http://support.dell.com/support/edoc...c/advanced.htm
Dimension 4500S http://support.dell.com/support/edoc...s/advanced.htm
Dimension 4590T http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension 4600 http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension 4600C http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension 4700 http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension 8100 http://support.dell.com/support/edoc...t/codemess.htm
Dimension 8200 http://support.dell.com/support/edoc...8200/codes.htm
Dimension 8250 http://support.dell.com/support/edoc...0/advanced.htm
Dimension 8300 http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension 8400 http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension C http://support.dell.com/support/edoc...m/codemess.htm
Dimension L http://support.dell.com/support/edoc...m/codemess.htm
Dimension Lxxxc http://support.dell.com/support/edoc...l/codemess.htm
Dimension P133a, P166a, M166a, M200a, and M233a http://support.dell.com/support/edoc...nplus/post.htm
Dimension P133v, P166v, and P200v http://support.dell.com/support/edoc...l/00000343.htm
Dimension XPS http://support.dell.com/support/edoc...m/adtshoot.htm
Dimension XPS Txxx and Txxxr http://support.dell.com/support/edoc...b/codemess.htm
Dimension Vxxx and Vxxxc http://support.dell.com/support/edoc...dwill/post.htm
Dimension XPS B Series http://support.dell.com/support/edoc...g/codemess.htm
Dimension XPS Dxxx http://support.dell.com/support/edoc...dalex/post.htm
Dimension XPS H233 and XPS H266 http://support.dell.com/support/edoc.../dcor/post.htm
Dimension XPS P60 FS http://support.dell.com/support/edoc...f/00000015.htm
Dimension XPS P60 M http://support.dell.com/support/edoc...m/00000014.htm
Dimension XPS 50/66 FS http://support.dell.com/support/edoc...f/00000021.htm
Dimension XPS 50/66 MDT (V4xxV) http://support.dell.com/support/edoc...m/00000025.htm
Dimension XPS Rxxx http://support.dell.com/support/edoc...dkhan/post.htm
OmniPlex 5xx/ME http://support.dell.com/support/edoc...x/00000051.htm
OptiPlex E1 http://support.dell.com/support/edoc.../dape/beep.htm
OptiPlex 160L http://support.dell.com/support/edoc...n/ug/solve.htm
OptiPlex 170L http://support.dell.com/support/edoc...n/ug/solve.htm
OptiPlex G1 http://support.dell.com/support/edoc.../ddur/beep.htm
OptiPlex GC http://support.dell.com/support/edoc...g/messages.htm
OptiPlex Gn and Gn+ http://support.dell.com/support/edoc...thred/beep.htm
OptiPlex Gs and Gs+ http://support.dell.com/support/edoc.../dalt/beep.htm
OptiPlex GX1 http://support.dell.com/support/edoc...n_gx1/beep.htm
OptiPlex GX1 Small-Form-Factor http://support.dell.com/support/edoc...t/messages.htm
OptiPlex GX1p http://support.dell.com/support/edoc..._gx1p/beep.htm
OptiPlex GXi http://support.dell.com/support/edoc.../dzer/beep.htm
OptiPlex GX50 http://support.dell.com/support/edoc...g/problems.htm
OptiPlex GX60 http://support.dell.com/support/edoc...ug/gethelp.htm
OptiPlex GX100 http://support.dell.com/support/edoc...g/messages.htm
OptiPlex GX110 http://support.dell.com/support/edoc...g/messages.htm
OptiPlex GX115 http://support.dell.com/support/edoc...g/messages.htm
OptiPlex GX150 http://support.dell.com/support/edoc...g/problems.htm
OptiPlex GX200 http://support.dell.com/support/edoc...g/messages.htm
OptiPlex GX220 http://support.dell.com/support/edoc...n/ug/basic.htm
OptiPlex GX240 http://support.dell.com/support/edoc...g/problems.htm
OptiPlex GX260 http://support.dell.com/support/edoc...g/solvprob.htm
OptiPlex GX270 http://support.dell.com/support/edoc...n/ug/solve.htm
OptiPlex GX280 http://support.dell.com/support/edoc...n/ug/tools.htm
OptiPlex GX300 http://support.dell.com/support/edoc...g/messages.htm
OptiPlex GX400 http://support.dell.com/support/edoc.../en/ug/ch5.htm
OptiPlex GXa http://support.dell.com/support/edoc.../dfuj/beep.htm
OptiPlex GXpro http://support.dell.com/support/edoc...k/postbeep.htm
OptiPlex L60 http://support.dell.com/support/edoc...g/solvprob.htm
OptiPlex N http://support.dell.com/support/edoc...dkill/beep.htm
OptiPlex NX http://support.dell.com/support/edoc...fujnx/beep.htm
OptiPlex NX1 http://support.dell.com/support/edoc...n_nx1/beep.htm
OptiPlex SX260 http://support.dell.com/support/edoc...n/ug/solve.htm
OptiPlex SX270 http://support.dell.com/support/edoc...n/ug/solve.htm
OptiPlex SX280 http://support.dell.com/support/edoc...n/ug/tools.htm
OptiPlex XMT575/590/5100/5120/5133 http://support.dell.com/support/edoc...t/00000038.htm
Precision WorkStation 210 http://support.dell.com/support/edoc...ftshk/beep.htm
Precision WorkStation 220 http://support.dell.com/support/edoc...n/ug/basic.htm
Precision WorkStation 330 http://support.dell.com/support/edoc...ml/solving.htm
Precision WorkStation 340 http://support.dell.com/support/edoc...n/ug/codes.htm
Precision WorkStation 350 http://support.dell.com/support/edoc...g/advanced.htm
Precision WorkStation 360 http://support.dell.com/support/edoc...g/advanced.htm
Precision WorkStation 370 http://support.dell.com/support/edoc...g/client_h.htm
Precision WorkStation 400 http://support.dell.com/support/edoc.../dtor/beep.htm
Precision WorkStation 410 http://support.dell.com/support/edoc...eqkmt/beep.htm
Precision WorkStation 420 http://support.dell.com/support/edoc...g/messages.htm
Precision WorkStation 450 http://support.dell.com/support/edoc...g/advanced.htm
Precision WorkStation 470 http://support.dell.com/support/edoc...ug/advtrbl.htm
Precision WorkStation 530 http://support.dell.com/support/edoc...tml/2codes.htm
Precision WorkStation 610 Mini Tower http://support.dell.com/support/edoc.../dvol/beep.htm
Precision WorkStation 620 http://support.dell.com/support/edoc...g/messages.htm
Precision WorkStation 650 http://support.dell.com/support/edoc...g/advanced.htm
Precision WorkStation 670 http://support.dell.com/support/edoc...ug/advtrbl.htm
Precision WorkStation 730 http://support.dell.com/support/edoc...g/messages.htm

HP BIOS beep codes http://welcome.hp.com/country/us/eng/support.html
Because Hewlett-Packard (HP) uses a variety of motherboards and BIOSs, their computers use a variety of beep codes. Instead of listing each model's beep codes, links are provided to the support pages of several popular Hewlett-Packard desktops. Note: Hewlett-Packard and Compaq merged in 2002 and the new company dropped the Compaq name from all but a few consumer product lines--such as Presario desktops and notebooks. This table lists only HP-branded desktops, while the next table lists Compaq-branded machines.
Model System codes and messages link
e-PC c10/s10 http://h20000.www2.hp.com/bizsupport...ectID=tis13707
Kayak http://h20000.www2.hp.com/bizsupport...ectID=tis06334
Kayak XM600 http://h20000.www2.hp.com/bc/docs/su...4/lpv07804.pdf
Kayak XU800 http://h20000.www2.hp.com/bc/docs/su...4/lpv07804.pdf
HP Multimedia PC series http://h20000.www2.hp.com/bizsupport...ectID=bph01686
Pavilion Desktops with Phoenix BIOS http://h20000.www2.hp.com/bizsupport...ectID=bph07107
Pavilion 5010, 5030, and 5040 http://h20000.www2.hp.com/bizsupport...ectID=bph01004
Pavilion 7xxx (7010, 7020, 7030, 7050, and possibly others) http://h20000.www2.hp.com/bizsupport...ectID=bph01053
Vectra PCs with Phoenix BIOS (VL4, VL5, VL7, VL8, VLi8, VE2, VE3, VEi7, XM4, XA5, and possibly others) http://h20000.www2.hp.com/bizsupport...ectID=bpv03305 http://h20000.www2.hp.com/bizsupport...ectID=tis06108
e-Vectra http://h20000.www2.hp.com/bizsupport...ectID=tis06446
Vectra VE 5/xxx Series 4 http://h200004.www2.hp.com/bc/docs/s...4/bpv03974.pdf
Vectra VL600 http://h20000.www2.hp.com/bizsupport...ectID=tis01866
Vectra XA5 http://h20000.www2.hp.com/bizsupport...ectID=tis06112
Vectra XA 5/XXX http://h20000.www2.hp.com/bizsupport...ectID=bpv03314
Vectra XE310 http://h20000.www2.hp.com/bizsupport...ectID=tis13051
Workstation i2000 http://h20000.www2.hp.com/bizsupport...ectID=tis07621
Workstation xw3100 http://h20000.www2.hp.com/bizsupport...ctID=c00038866


Compaq (Hewlett-Packard) http://h10025.www1.hp.com/ewfrf/wc/s...eC?lc=en&cc=us
Because Compaq uses a variety of motherboards and BIOSs, their computers use a variety of beep codes. Instead of listing each model's beep codes, links are provided to support documentation for several popular Compaq desktops. Note: Hewlett-Packard and Compaq merged in 2002 and the new company dropped the Compaq name from all but a few consumer product lines--such as Presario desktops and notebooks. Official Compaq support documentation is difficult to find on HPs Web site.
Model System codes and messages link
Business Desktop d330 and d530 http://h20000.www2.hp.com/bizsupport...ctID=c00274415
Multiple Models http://forums1.itrc.hp.com/service/f...hreadId=222666


IBM BIOS beep codes http://www.ibm.com/support/us/
Because IBM uses a variety of motherboards and BIOSs, their computers use a variety of beep codes. Instead of listing each model's beep codes, links are provided to the support documentation of several popular IBM desktops. Note: In December 2004, IBM announced plans to sells it's PC division to China-based Lenovo Group. While the links listed here were accurate as of this documents publication, they may change due to the sale.
Model System codes and messages link
Aptiva 2137, 2138 http://www-307.ibm.com/pc/support/si...id=DETR-43VMUY
Aptiva 2140 and 2142 http://www-307.ibm.com/pc/support/si...id=PMYS-3KWRR2
Aptiva 2144 and 2168 http://www-307.ibm.com/pc/support/si...id=DETR-3SRSAB
Aptiva 2158, 2163 and 2164 http://www-307.ibm.com/pc/support/si...id=DETR-42QQY6
Aptiva 2159 http://www-307.ibm.com/pc/support/si...id=DETR-42JU2A
Aptiva 2170, 2171, and 2172 http://www-307.ibm.com/pc/support/si...id=MIGR-48UPZ9
Aptiva 2190 http://www-307.ibm.com/pc/support/si...id=MIGR-4CURG4
PC 300 Series Type 6268, 6278, 6288, 6338, 6563, 6564, 6565, 6566, 6574, and 6593 Aptiva Type 2173, 2178, and 2198 IntelliStation Type 6878 http://www-307.ibm.com/pc/support/si...id=MIGR-4B2JQP
IntelliStation E Pro Type 6867 IBM PC300PL Type 6584, 6594 and 6595 http://www-307.ibm.com/pc/support/si...id=MIGR-4DSQKY
IntelliStation http://www-307.ibm.com/pc/support/si...id=MIGR-4B9PPW
IntelliStation E Pro Type 6204 and 6214 http://www-307.ibm.com/pc/support/si...cid=MIGR-39494
IntelliStation E Pro Type 6216 and 6226 http://www-307.ibm.com/pc/support/si...cid=MIGR-44191
IntelliStation M Pro Type 6219 http://www-307.ibm.com/pc/support/si...cid=MIGR-45692
IntelliStation M Pro Type 6220 and 6230 http://www-307.ibm.com/pc/support/si...cid=MIGR-52732
IntelliStation A Pro Type 6224 http://www-307.ibm.com/pc/support/si...cid=MIGR-55657
IntelliStation M Pro Type 6229 http://www-307.ibm.com/pc/support/si...cid=MIGR-41404
IntelliStation M Pro Type 6231 and 6849 http://www-307.ibm.com/pc/support/si...id=MIGR-4S6UYK
IntelliStation M Pro Type 6233, 6850 http://www-307.ibm.com/pc/support/si...id=MIGR-4ZSKLK
IntelliStation R Pro Type 8654 http://www-307.ibm.com/pc/support/si...id=MIGR-4WBPPT
IntelliStation Z Pro Type 6221 http://www-307.ibm.com/pc/support/si...cid=MIGR-45139
IntelliStation Z Pro Type 6223 and 6227 http://www-307.ibm.com/pc/support/si...cid=MIGR-56846
NetVista 6269, 6578, and 6579 http://www-307.ibm.com/pc/support/si...id=MIGR-4L4TT5