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Beep Codes at Computer Post
When a computer is initially powered on the entire system goes through what is known as a power-on self test. This test basically goes through a run down of the systems components to make everything is in good standing and working order.
If any problems are discovered during this test your computer will emit beep-like sounds known as BIOS beep codes. The total number and total length of the beeps represent an error code that provides you with an easy way to determine which part of your system is malfunctioning.
A good way to think of this is your computer sending a MORSE code sequence in the form of a distress call letting you know that something is wrong and needs to be corrected in order for the computer to operate properly.
One short beep usually will be heard if there are no errors found and the system is operational. Any sequence of BIOS beep codes other than a single short beep represents an error within the system.
Common BIOS Beep Codes
The following are generally what a certain beep code will mean. It is always a good idea to check your specific version of the BIOS to make sure you are interpreting the beep codes correctly.
Two Short Beeps - This is an error within the POST and the computer will typically display an error code on the screen when this occurs.
No Beeps - If you do not hear any BIOS beep codes at all this usually means that there is a problem with either the power supply or system board.
Continuous Beeping - A continuous beep designates that there could be a problem with the power supply, system board or even a simple keyboard error.
Repeating Short Beeps - If you hear a series of short repeating BIOS beep codes, the cause is normally due to an issue with the power supply or system board.
One Long and One Short Beep - This particular code means an error was found with the system board.
One Long and Two Short Beeps - This BIOS beep sequence reveals that there is an issue with a display adapter.
One Long and Three Short Beeps - If you hear this series of beeps being emitted, there is an issue with your enhanced graphics adapter.
Three Long Beeps - Three beeps of longer length represent a keyboard card error.
AMI Beep Codes
One Short Beep - This is an error with the DRAM and specifically dealing with DRAM refresh failure.
Two Short Beeps - This is an error with the Parity circuit and specifically dealing with Parity circuit failure.
Three Short Beeps - This is an error with the Base 64K RAM.
Four Short Beeps - This is an error with the System timer.
Five Short Beeps - This is a Process failure.
Six Short Beeps - This is an error with Keyboard controller Gate A20.
Seven Short Beeps - This is an error with the Virtual mode exception.
Eight Short Beeps - This is an error with the Display memory Read/Write test.
Nine Short Beeps - This is an error with the ROM BIOS checksum.
Ten Short Beeps - This is an error with the CMOS shutdown Read/Write.
Eleven Short Beeps - This is an error with the Cache Memory.
One Long, Three Short Beeps - This is an error with the Conventional/Extended memory.
One Long, Eight Short Beeps - This is an error with the Display/Retrace test.
IBM Beep Codes
One Short Beep - No problems.
Continuous Beeps - Check for a lose card or short issue.
Two Short Beeps - Error. Check the screen for the erorr details.
Repeating Beeps - Check for a lose card or short issue.
One Long, One Short Beep - Their is a problem with the motherboard.
One Long, Two Short Beep - Video issue of some sort.
One Long, Three Short Beep - Video issue of some sort.
One Long, Three Short Beeps - Video issue of some sort.
Three Long Beeps - Keyboard issue of some sort.
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