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Computer ComputerPOST POSTand andbeep beepcodes codes

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Computer Computer POST and beep codes The computer POST(power-on POST(power-on self-test) checks a computer's internal ha compatibility and connection before starting the remainder of the boot pr p the the computer computer passes passes the the POST, POST, the the computer computer may may give give aa single single beep beep (so (so computers may beep twice) as it starts and continue to boot. However, i computer computer fails fails the the POST, POST, the the computer computer will will either either not not beep beep or or generate generate aa that tells the user the source of the problem. problem.

If your comput computer er has an irregular irregular POST or a beep cod code e not mentioned mentioned below POST POST troubleshooting troubleshooting stepsto stepsto determine the failing hardware component

AMI BIOS beep codes Award BIOS beep codes

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Computer ComputerPOST POSTand andbeep beepcodes codes

Below are the AMIBIOS AMI BIOS Beep code codes s that can occur occur.. However, However, becaus because e of th of different computer manufacturers with this BIOS, the beep codes may var

Beep Code

Descriptions

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

two - tone siren

Low CPU Fanspeed, Fanspeed, Voltage Level issue

AWARD BIOS beep codes

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Computer ComputerPOST POSTand andbeep beepcodes codes

1 llo ong, 3 short

Video card not d de etected (reseat video c ca ard) o orr card

Beeps repeating endlessly

RAM problem.

Repeated high frequency beeps while PC is running

Overheatingprocessor Overheating processor ((CPU CPU))

Repeated beeps alternating high & low frequency

Issue with the processor ((CPU CPU), ), possib possibly ly dama

If any other corre correctable ctable hardware hardware issues are found, the BIOS displays a mes

Dell beep codes Beep Code

Description

1 beep

BIOS BIOS ROMcorruption ROM corruption or failure

2 beeps

Memory ( RAM RAM)) not detected

3 beeps

Motherboardfailure Motherboard failure

4 beeps

Memory ( RAM RAM)) failur failure e

5 beeps

CMOS Batteryfailure Batteryfailure

6 beeps

Video card cardfailure failure

7 beeps

Bad processor ( CPU CPU))

For other Dell beep codes, please refer to Dell's Beep Codes and PSA Diagno

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Computer ComputerPOST POSTand andbeep beepcodes codes

Beep Code

Description

No Beeps

No Power, Loose Card, or Short.

1 Short Beep

Normal POST, c omputer is ok.

2 Short Beep

POST error, review screen for er

Continuous Beep

No Power, Loose Card, or Short.

Repeating Short Beep

No Power, Loose Card, or Short.

1 Long and 1 Short Beep

Motherboard issue.

1 Long and 2 Short Beeps

Video (Mono/CGA Display Circuit

1 Long and 3 Short Beeps. Beeps.

Video (EGA) Display Circuitry.

3 Long Beeps

Keyboard or Keyboard card error

1 Beep, Blank or Incorrect Display

Video Display Circuitry.

Macintosh startup tones Tones

Error

Err Error Tone. one. (t (two wo se setts o off d dif iffe fere rent nt tone tones) s)

Prob Proble lem m w wit ith h lo logi gic c boar board d o orr

Startup tone, drive spins, no video

Problem with video controll

Powers on, no tone.

Logic board problem.

High Tone, four higher tones.

Problem with SIMM.

Phoenix BIOS beep codes

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Computer ComputerPOST POSTand andbeep beepcodes codes

1- 1 - 2- 1

Get CPU Type.

1- 1- 2- 3

Initialize s sy ystem hardware.

1-1-31-1-3-1 1

Initialize c ch hip set registers w wiith initial PO POST va values.

1- 1- 3- 2

Set in POST flag.

1- 1- 3- 3

Initialize C CP PU rre egisters.

1-11-1-44-1 1

Initialize cache to iin nitial POST v va alues.

1- 1- 4- 3

Initialize I/O.

1- 2- 1- 1

Initialize Power Management.

1-21-2-11-2 2

Load al alternate rre egisters w wiith iin nitial P PO OST v va alues.

1- 2- 1- 3

Jump to UserPatch0.

11-22 -22-1 1

Initialize keyboard controller.

1- 2- 2- 3

BIOS ROM checksum.

1- 2- 3- 1

8254 timer initialization.

11-22 -33-3 3

8237 DM DMA c co ontroller iin nitialization.

1-21-2-44-1 1

Reset Programmable Interrupt Controller.

1- 3- 1- 1

Test DRAM refresh.

1- 3- 1- 3

Test 8742 Keyboard Controller.

1- 3- 2- 1

Set ES segment to register to 4 GB.

1- 3- 3- 1

28 Autosize DRAM.

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Computer ComputerPOST POSTand andbeep beepcodes codes

1- 4- 3- 1

Shadow system BIOS ROM.

1- 4- 3- 2

Reinitialize the cache.

1- 4- 3- 3

Autosize cache.

1-41-4-44-1 1

Configure advanced chipset registers.

1-41-4-44-2 2

Load a allternate rre egisters w wiith C CM MOS va values.

2- 1- 1- 1

Set Initial CPU speed.

2- 1- 1- 3

Initialize interrupt vectors.

2- 1- 2- 1

Initialize BI BIOS in interrupts.

2- 1- 2- 3

Check ROM copyright notice.

2-12-1-22-4 4

Initialize manager for PC PCI Options ROMs.

2-12-1-33-1 1

Check video c co onfiguration against CMOS.

2- 1- 3- 2

Initialize PCI bus and devices.

2-12-1-33-3 3

Initialize all video adapters in system.

2- 1- 4- 1

Shadow video BIOS ROM.

2- 1- 4- 3

Display c co opyright no notice.

2- 2- 1- 1

Display CPU Type and speed.

2- 2- 1- 3

Test keyboard.

2- 2- 2- 1

Set key click if enabled.

2- 2- 2- 3

56 Enable keyboard

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Computer ComputerPOST POSTand andbeep beepcodes codes

2- 3 - 2- 1

Jump to UserPatch1.

22-33 -22-3 3

Configure ad advanced c ca ache rre egisters.

2- 3- 3- 1

Enable external and CPU caches.

2- 3- 3- 3

Display external cache size.

2- 3- 4- 1

Display shadow message.

22-33 -44-3 3

Display non- disposable segments.

2- 4- 1- 1

Display error messages.

2- 4- 1- 3

Check ffo or co configuration er errors.

2- 4- 2- 1

Test real - time clock.

2- 4- 2- 3

Check for key board errors

22-44 -44-1 1

Set up h ha ard ware interrupts vectors.

2- 4- 4- 3

Test c co oprocessor if p prresent.

3- 1- 1- 1

Disable onboard I/O ports.

3-13-1-11-3 3

Detect a an nd install external RS232 ports.

3-13-1-22-1 1

Detect and install external parallel ports.

33-11 -22-3 3

Re- initialize onboard I/O ports.

3- 1- 3- 1

Initialize BIOS Da Data Area.

33-11 -33-3 3

Initialize Extended B BIIOS Data Area.

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Computer ComputerPOST POSTand andbeep beepcodes codes

3- 2 - 2- 3

Clear huge ES segment register.

3- 2- 3- 1

Search for option ROMs.

3- 2- 3- 3

Shadow option ROMs.

3- 2- 4- 1

Set up P Po ower Management.

3- 2- 4- 3

Enable h ha ardware iin nterrupts.

3- 3- 1- 1

Set time of day.

3- 3- 1- 3

Check key lock.

3- 3- 3- 1

Erase F2 prompt.

3- 3- 3- 3

Scan for F2 key stroke.

3- 3- 4- 1

Enter SETUP.

3- 3- 4- 3

Clear in POST flag.

3- 4- 1- 1

Check for errors

3-43-4-11-3 3

POST do done - prepare tto o b bo oot operating s sy ystem.

3- 4- 2- 1

One beep.

3- 4- 2- 3

Check password (optional).

3- 4- 3- 1

Clear global descriptor table.

3- 4- 4- 1

Clear parity checkers.

3- 4- 4- 3

Clear screen (optional).

3- 4- 4- 4

Check vi virus an and b ba ackup re reminders.

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Computer ComputerPOST POSTand andbeep beepcodes codes

4- 2- 3- 1

Shutdown error.

4- 2- 3- 3

Extended Block Move.

4- 2- 4- 1

Shutdown 10 error.

4- 3- 1- 3

Initialize the chipset.

4- 3- 1- 4

Initialize re refresh counter.

4- 3- 2- 1

Check for Forc ed Flash.

4- 3- 2- 2

Check HW status of ROM.

4- 3- 2- 3

BIOS ROM is OK.

4- 3- 2- 4

Do a complete RAM test.

4- 3- 3- 1

Do OEM initialization.

44-33 -33-2 2

Initialize interrupt controller.

4- 3- 3- 3

Read in bootstrap code.

4- 3- 3- 4

Initialize a alll v ve ectors.

4- 3- 4- 1

Boot the Flash program.

4- 3- 4- 2

Initialize the boot device.

4- 3- 4- 3

Boot code was read OK.

two-tone siren

Low CPU Fan Fanspeed, speed, Voltage Level issue

Additional information

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Computer ComputerPOST POSTand andbeep beepcodes codes

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Computer ComputerPOST POSTand andbeep beepcodes codes

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

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You are here: Dictionary Dictionary> > C - Definitions

CPU Alternatel nately y referred to as a processor, central processor , or micropr Alter the CPU(pronounced sea-pea-you) is the Central Central Processing Processing Unit Unit of computer. A computer's CPU handles all instructions instructionsit it receives from har softwarerunning softwarerunning on the computer.

Tip: The CPU is often referr referred ed to as the brainof brainof the compu computer. ter. However, However, it appro appropriate priate to refer to software softwareas as the brain and the CPU as a very efficient

Note: Many new computer users may improperly call their computer computerand and so their monitor monitorthe the CPU. When referring referring to your computer or monitor monitor,, it is pro to them as either the "computer" or "monitor" and not a CPU.

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

corresponding holes in the socket. Today, most CPU's resemble the picture s however, Intel Inteland and AMDhave AMDhave also experimented with slot processors processorsthat that w larger and slid into a slot on the motherboard. Also, over the years there ha dozen dozens s of different type types s of sockets socketson on motherboards. Each Each socket socket only only sup sup types of processo processors, rs, and each has its own pin layout.

Components Components of of the the CPU CPU In the CPU, the primary components are the ALU ALU(Arithmetic (Arithmetic Logic Unit) that mathematical, logical, and decision operations and the CU(Control CU (Control Unit) tha the processors operations.

Over the the history of of computer processors, the the speed speed ((clock clock speed speed)) and capa processor have dramatically improved. For example, the first microprocessor microprocesso 4004that 4004that was released released Novembe Novemberr 15, 1971, 1971, and had 2,300 transistors transistorsand and 60,000 operations per second. The Intel Pentium processor pictured above h transistors and performs around 188,000,000 instructions per second.

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

Today, in addition to the different names of computer processors there are d architectures ((32-bit 32-bitand and 64-bit 64-bit), ), speed speeds, s, and capabilities capabilities.. Below is a list of common types of CPUs for home or business computers.

Note: There are multiple versions for some of these CPU types.

AMD processors

K6-2

Sempron

Turion Turion 64

Phenom X3

K6-III

Athlon 64

Athlon 64 X2

Athlon 66-serie series s

Athlon

Mobile Athlon 64

Turion 64 X2

Athlon 44-serie series s

Duron

Athlon XP-M

Phenom FX

Athlon X2

Athlon XP

Athlon 64 FX

Phenom X4

Phenom II

Intel processors

4004

Pentium

Pentium 4

Pentium Extreme

8080

Pentium w/

Mobile Pentium

Edition

8086

MMX

4-M 4- M

Core Duo

8087 8088

Pentium Pro Pentium II

Pentium D

Core 2 Duo

80286

Celeron

(286)

Pentium III

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

Some mobile devices, like smartphones and tablets, use ARMCPUs. ARMCPUs. These CPUs are smaller in size, require less power and generate less heat.

Full list of comput computer er CPU manufacturers.

CPU history The CPU was first develo developed ped at Intel with the help of Ted Hoffand and others in the early 1970's. The first processor released released by Intel was the 4004 processor, shown in the picture to the right.

CPU history.

Related pages How to determine the type and speed of a processor. How to install a computer processor. Compu Computer ter CPU help and suppor support. t.

Also see: see:Coprocessor Coprocessor,, CPU socket socket,, Dual-core, Dual-core, Logic chip chip,, Motherboard Motherboard,, Par

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

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What WhatisisCPU CPU(Central (CentralProcessing ProcessingUnit)? Unit)?

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