Computer POST and beep codes
The computer power-on self-test (POST) tests the computer to make sure it meets the necessary system requirements and that all hardware is working properly before starting the remainder of the boot process. If the computer passes the POST the computer will have a single beep (with some computer BIOS manufacturers it may beep twice) as the computer starts and the computer will continue to start normally. However, if the computer fails the POST, the computer will either not beep at all or will generate a beep code, which tells the user the source of the problem.
If you’re receiving an irregular POST or a beep code not mentioned below follow the POST troubleshooting steps to determine the failing hardware component.
Below are the AMI BIOS Beep codes that can occur. However, because of the wide variety of different computer manufacturers with this BIOS, the beep codes may vary.
|1 short||DRAM refresh failure|
|2 short||Parity circuit failure|
|3 short||Base 64K RAM failure|
|4 short||System timer failure|
|5 short||Process failure|
|6 short||Keyboard controller Gate A20 error|
|7 short||Virtual mode exception error|
|8 short||Display memory Read/Write test failure|
|9 short||ROM BIOS checksum failure|
|10 short||CMOS shutdown Read/Write error|
|11 short||Cache Memory error|
|1 long, 3 short||Conventional/Extended memory failure|
|1 long, 8 short||Display/Retrace test failed|
Below are Award BIOS Beep codes that can occur. However, because of the wide variety of different computer manufacturers with this BIOS, the beep codes may vary.
|1 long, 2 short||Indicates a video error has occurred and the BIOS cannot initialize the video screen to display any additional information|
|Any other beep(s)||RAM problem.|
If any other correctable hardware issues, the BIOS will display a message.
Below are general IBM BIOS Beep codes that can occur. However, because of the wide variety of models shipping with this BIOS, the beep codes may vary.
|No Beeps||No Power, Loose Card, or Short.|
|1 Short Beep||Normal POST, computer is ok.|
|2 Short Beep||POST error, review screen for error code.|
|Continuous Beep||No Power, Loose Card, or Short.|
|Repeating Short Beep||No Power, Loose Card, or Short.|
|One Long and one Short Beep||Motherboard issue.|
|One Long and Two Short Beeps||Video (Mono/CGA Display Circuitry) issue.|
|One Long and Three Short Beeps.||Video (EGA) Display Circuitry.|
|Three Long Beeps||Keyboard / Keyboard card error.|
|One Beep, Blank or Incorrect Display||Video Display Circuitry.|
|Error Tone. (two sets of different tones)||Problem with logic board or SCSI bus.|
|Startup tone, drive spins, no video||Problem with video controller.|
|Powers on, no tone.||Logic board problem.|
|High Tone, four higher tones.||Problem with SIMM.|