Motherboard Beep Codes - Complete Reference | Madhusudan Upadhyay — ICT Support Executive

Comprehensive reference guide to motherboard BIOS beep codes for AMI, Award, Phoenix, and other BIOS manufacturers - essential for hardware troubleshooting.

#Motherboard#Beep Codes#BIOS#POST#Hardware Troubleshooting#DiagnosticsHardwareTroubleshootingDiagnostics

When a computer fails to boot, the BIOS communicates errors through beep codes during POST (Power-On Self-Test). This reference covers major BIOS manufacturers.

Quick Reference Table

Beep Pattern	AMI BIOS	Award BIOS	Phoenix BIOS
1 short	System OK	System OK	System OK
2 short	Parity error	CMOS error	-
3 short	Base 64K memory failure	Keyboard error	-
4 short	System timer failure	-	-
5 short	Processor error	-	-
6 short	Keyboard controller error	-	-
7 short	Virtual mode error	-	-
8 short	Display memory error	Video error	-
9 short	ROM checksum error	-	-
10 short	CMOS shutdown register	-	-
11 short	Cache memory error	-	-
1 long, 2 short	-	Video error	Video error
1 long, 3 short	-	Video memory error	-
Continuous	Power/PSU	Memory	-
Continuous short	Power/PSU	-	-

AMI BIOS (Most Common)

Beeps	Meaning	Action
1 short	System OK	Normal boot
2 short	Parity Circuit Failure	Reseat/replace RAM
3 short	Base 64K Memory Failure	Reseat/replace first RAM bank
4 short	System Timer Failure	Motherboard issue
5 short	Processor Failure	Reseat CPU, check cooler
6 short	Keyboard Controller Error	Check keyboard/port
7 short	Virtual Mode Exception	CPU/Motherboard
8 short	Display Memory Error	Reseat GPU, check VRAM
9 short	ROM BIOS Checksum Error	BIOS corruption, reflash
10 short	CMOS Shutdown Register	Motherboard
11 short	Cache Memory Error	Disable cache in BIOS
1 long, 3 short	Conventional/Extended Memory	RAM issue
1 long, 8 short	Display/Retrace Test Failed	GPU/Video RAM
Continuous	Power Supply/PSU	Check PSU, cables
Continuous short	Power Supply	Check PSU

Award BIOS

Beeps	Meaning	Action
1 short	System OK	Normal boot
1 long, 2 short	Video Error	Reseat GPU, check monitor cable
1 long, 3 short	Video Memory Error	GPU VRAM failure
Continuous	Memory Error	Reseat/test RAM sticks
Continuous short	Power Supply	Check PSU
High-low pattern	CPU Overheating	Check cooler, thermal paste

Phoenix BIOS

Beeps	Meaning
1-1-3	CMOS read/write error
1-1-4	BIOS ROM checksum error
1-2-1	Programmable interval timer
1-2-2	DMA initialization error
1-2-3	DMA page register error
1-3-1	RAM refresh error
1-3-3	First 64K RAM error
1-3-4	First 64K RAM test error
1-4-1	Address line error
1-4-2	Parity error
2-1-1	First 64K RAM bit error
2-1-2	First 64K RAM parity error
2-2-3	Interrupt vector error
2-3-1	Keyboard controller error
2-3-2	Keyboard error
3-1-1	Slave DMA register error
3-1-2	Master DMA register error
3-1-3	Master interrupt mask register
3-2-4	Keyboard controller test error
3-3-1	Video memory error
3-3-2	Video controller error
3-4-1	Screen initialization error
3-4-2	Screen retrace test error
4-2-1	Timer tick error
4-2-2	Shutdown error
4-2-3	Gate A20 error
4-3-1	RAM test error
4-3-3	Interval timer 2 error
4-3-4	Time-of-day clock error
4-4-1	Serial port error
4-4-2	Parallel port error
4-4-3	Math coprocessor error

Note: Phoenix uses X-Y-Z pattern (e.g., 1-3-3 = 1 beep, pause, 3 beeps, pause, 3 beeps)

Dell BIOS

Beeps	Meaning
1-1-2	Microprocessor register failure
1-1-3	NVRAM failure
1-1-4	ROM BIOS checksum failure
1-2-1	System board failure
1-2-2	Memory failure
1-2-3	Video card failure
1-3-1	RAM failure
2-1-1	System board failure
2-1-2	Memory failure
2-2-1	Video card failure
3-1-1	System board failure
3-2-1	Memory failure
3-3-1	Video card failure

HP/Compaq BIOS

Beeps	Meaning
1 short	System OK
1 long, 1 short	System board failure
1 long, 2 short	Video error
1 long, 3 short	Memory error
2 short	Memory error
3 short	System board failure
4 short	Video error
5 short	System board failure

Lenovo BIOS

Beeps	Meaning
1 short	System OK
2 short	POST error (check screen)
1 long, 2 short	Video error
1 long, 3 short	Memory error
Continuous	Power/PSU

Mac Startup Tones

Sound	Meaning
Single tone	Normal startup (pre-2016)
3 tones, 5s pause	RAM not detected
3 long, 3 short, 3 long	EFI firmware error
Continuous tone	Firmware update in progress

Troubleshooting Workflow

1. Listen Carefully

Count beeps
Note pattern (long/short)
Note pauses

2. Identify BIOS

Screen at boot: AMI, Award, Phoenix, Dell, HP, Lenovo
Check motherboard manual

3. Basic Checks (Before Deep Dive)

✅ Power cable seated
✅ Monitor connected
✅ Keyboard connected
✅ RAM fully seated
✅ GPU fully seated (if discrete)
✅ CPU power connected (4/8-pin)

4. Minimal Boot Test

Disconnect all drives
Remove all but 1 RAM stick
Remove discrete GPU (use iGPU if available)
Boot → Listen for beeps

5. Component Isolation

Component	Test Method
RAM	Test each stick individually in each slot
GPU	Try integrated graphics; test card in another system
PSU	Paperclip test or PSU tester; swap known good
CPU	Reseat, check for bent pins, verify cooler
Motherboard	Visual inspect: bulging caps, burns, corrosion

6. Clear CMOS

Power off, unplug
Remove CMOS battery (CR2032)
Wait 5 minutes OR short CLR_CMOS jumper
Reinsert battery, power on

Modern UEFI Systems

Many modern systems (2015+) use UEFI with:

No beep codes (silent POST)
LED/Q-Code displays on motherboard
Debug LEDs: CPU, DRAM, VGA, BOOT
Check motherboard manual for Q-Code meanings

Resources

AMI BIOS Beep Codes
Award BIOS Beep Codes
Phoenix BIOS Beep Codes
Computer Hope Beep Codes
[Motherboard Manual (your specific model)]

Motherboard Beep Codes - Complete Reference