When you power on a computer the BIOS immediately takes control of the computer and performs the P.O.S.T (Power On Self Test). At the end of the POST the computer will play an audible 'BEEP' through either the PC's internal speaker of through speakers attached to the sound card (if you have a built-in sound chip). If the POST completed successfully without detecting any problems with then system will play a single short beep to let you know the test is complete and the computer will continue to startup and load the operating system.
If during the POST the BIOS detects a problem it will normally display a visual error message on the monitor explaining what the problem is. However, if a problem is detected before the BIOS initializes the video card, or a video card is not present or not detected then the BIOS will play several 'BEEPS' through the speaker to let you know there is a problem. Depending on the type of the BIOS you have the BIOS may play beeps in a specific pattern to indicate what the problem is, or play the same beep a number of times indicating the problem. It is very important that you pay close attention to the number and/or pattern of the beeps your computer plays on startup.
Below is a table of the most common AMI, Phoenix and Award BIOS beep codes.
AMI (American Megatrends International) BIOS Beep Codes.
AMI BIOS uses beeps of the same length and pitch. The error is displayed as a number of beeps. For example, 4 beeps indicated a timer failure.
BEEP CODE MEANING POSSIBLE CAUSE
1 Beep : (No video) Memory refresh failure Bad memory
2 Beeps : Memory parity error Bad memory
3 Beeps : Base 64K mem failure Bad memory
4 Beeps : Timer not operational Bad motherboard
5 Beeps : Processor error Bad processor
6 Beeps : 8042 Gate A20 failure Bad CPU or Motherboard
7 Beeps : Processor exception Bad processor
8 Beeps : Video memory error Bad video card or memory
9 Beeps : ROM checksum error Bad BIOS
10 Beeps : CMOS checksum error Bad motherboard
11 Beeps : Cache memory bad Bad CPU or motherboard
Award BIOS Beep Codes
Award BIOS uses beeps of varying duration. A long beep will typically last for 2 seconds while a short beep will last only 1 second. Award BIOS also uses beeps of different frequency to indicate critical errors. If an Award BIOS detects that the CPU is overheating it may play a high pitched repeating beep while the computer is running.
BEEP CODE MEANING POSSIBLE CAUSE
1 Long, 2 Short : Video adapter failure Bad video adapter
Repeating (Endless loop) : Memory error Bad memory or bad connection
1 Long, 3 Short :Video adapter failure Bad video adapter or memory
High freq. beeps (while running) : CPU is overheating CPU fan failure
Repeating High, Low beeps : CPU failure Bad processor
Phoenix BIOS Beep Codes
Phoenix BIOS uses beep code patterns to indicate problems. In the table below the '-' indicates a brief pause between beeps.
Example: 1 - 1 - 2 would sound like BEEP BEEP BEEP BEEP
BEEP CODE MEANING POSSIBLE CAUSE
1 - 1 - 2 CPU / motherboard failure Bad CPU / motherboard
1 - 1 - 3 CMOS read/write failure Bad motherboard
1 - 1 - 4 BIOS ROM failure Bad BIOS chip
1 - 2 - 1 Timer failure Bad motherboard
1 - 2 - 2 DMA failure Bad motherboard
1 - 2 - 3 DMA failure Bad motherboard
1 - 3 - 1 Memory refresh failure Bad memory
1 - 3 - 2 64K memory failure Bad memory
1 - 3 - 3 64K memory failure Bad memory
1 - 3 - 4 64K memory failure Bad memory
1 - 4 - 1 Address line failure Bad memory
1 - 4 - 2 Parity error Bad memory
1 - 4 - 3 Timer failure Bad motherboard
1 - 4 - 4 NMI port failure Bad motherboard
2 - 1 - 1 64K memory failure Bad memory
2 - 1 - 2 64K memory failure Bad memory
2 - 1 - 3 64K memory failure Bad memory
2 - 1 - 4 64K memory failure Bad memory
2 - 2 - 1 64K memory failure Bad memory
2 - 2 - 2 64K memory failure Bad memory
2 - 2 - 3 64K memory failure Bad memory
2 - 2 - 4 64K memory failure Bad memory
2 - 3 - 1 64K memory failure Bad memory
2 - 3 - 2 64K memory failure Bad memory
2 - 3 - 3 64K memory failure Bad memory
2 - 3 - 4 64K memory failure Bad memory
2 - 4 - 1 64K memory failure Bad memory
2 - 4 - 2 64K memory failure Bad memory
2 - 4 - 4 64K memory failure Bad memory
2 - 4 - 4 64K memory failure Bad memory
3 - 1 - 1 Slave DMA failure Bad motherboard
3 - 1 - 2 Master DMA failure Bad motherboard
3 - 1 - 3 Interrupt controller failure Bad motherboard
3 - 1 -4 Slave IC failure Bad motherboard
3 - 2 -2 Interrupt Controller failure Bad motherboard
3 - 2 - 3
3 - 2 - 4 Keyboard control failure Bad motherboard
3 - 3 - 1 CMOS batter failure Bad CMOS battery
3 - 3 - 2 CMOS configuration error Incorrect setting
3 - 3 - 3
3 - 3 - 4 Video memory failure Bad video card or memory
3 - 4 - 1 Video init failure Bad video card or memory
4 - 2 - 1 Timer failure Bad motherboard
4 - 2 - 2 CMOS shutdown failure Bad motherboard
4 - 2 - 3 Gate A20 failure Bad motherboard
4 - 2 - 4 Unexpected interrupt Bad processor
4 - 3 - 1 RAM test failure Bad memory
4 - 3 - 3 Timer failure Bad motherboard
4 - 3 - 4 RTC failure Bad motherboard
4 - 4 - 1 Serial port failure Bad motherboard
4 - 4 - 2 Parallel port failure Bad motherboard
4 - 4 - 3 Coprocessor failure Bad motherboard or CPU.
9 - 2 - 1 Video adapter incompatibility Use a different brand of video card
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