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Interpreting POST Diagnostic Front Panel LEDs and Audible Codes

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Table 9-2 Diagnostic Front Panel LEDs and Audible Codes (continued) Activity Beeps Possible Cause Recommended Action Red Power LED flashes two 2 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Processor thermal 1. protection activated: A fan may be blocked or not turning. 2. OR The heat sink/fan assembly is not properly 3. attached to the processor. Ensure that the computer air vents are not blocked and the processor cooling fan is running. Open hood, press power button, and see if the processor fan spins. If the processor fan is not spinning, make sure the fan's cable is plugged onto the system board header. If fan is plugged in, but is not spinning, then replace heat sink/fan assembly. 4. Contact an authorized reseller or service provider. Red Power LED flashes three 3 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Processor not installed (not an indicator of bad processor). 1. Check to see that the processor is present. 2. Reseat the processor. Red Power LED flashes four 4 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Power failure (power supply is overloaded). 1. Open the hood and ensure the 4 or 6-wire power supply cable is seated into the connector on the system board. 2. Check if a device is causing the problem by removing ALL attached devices (such as hard or optical drives and expansion cards). Power on the system. If the system enters the POST, then power off and replace one device at a time and repeat this procedure until failure occurs. Replace the device that is causing the failure. Continue adding devices one at a time to ensure all devices are functioning properly. 3. Replace the power supply. 4. Replace the system board. Red Power LED flashes five 5 times, once every second, followed by a two second pause. Beeps stop after fifth iteration but LEDs continue until problem is solved. Pre-video memory error. CAUTION: To avoid damage to the DIMMs or the system board, you must unplug the computer power cord before attempting to reseat, install, or remove a DIMM module. 1. Reseat DIMMs. 2. Replace DIMMs one at a time to isolate the faulty module. 3. Replace third-party memory with HP memory. 4. Replace the system board. Interpreting POST Diagnostic Front Panel LEDs and Audible Codes 183

Section	Page
Product Features	11
Standard Configuration Features	11
Microtower (MT) Front Panel Components	12
Small Form Factor (SFF) Front Panel Components	13
Microtower (MT) Rear Panel Components	14
Small Form Factor (SFF) Rear Panel Components	15
Serial Number Location	16
Installing and Customizing the Software	17
Installing the Windows operating system	17
Downloading Windows 7 updates	18
Installing or upgrading device drivers	18
Customizing the monitor display	18
Computer Setup (F10) Utility	19
Computer Setup (F10) Utilities	19
Using Computer Setup (F10) Utilities	20
Computer Setup—File	21
Computer Setup—Storage	22
Computer Setup—Security	25
Computer Setup—Power	28
Computer Setup—Advanced	29
Recovering the Configuration Settings	31
Illustrated parts catalog	32
Microtower (MT) chassis spare parts	32
Computer major components	32
Cables	34
Misc parts	35
Drives	37
Misc boards	37
Sequential part number listing	38
Small Form Factor (SFF) chassis spare parts	41
Computer major components	41
Cables	43
Misc parts	44
Drives	46
Misc boards	46
Sequential part number listing	47
Routine Care, SATA Drive Guidelines, and Disassembly Preparation	50
Electrostatic Discharge Information	50
Generating Static	50
Preventing Electrostatic Damage to Equipment	51
Personal Grounding Methods and Equipment	51
Grounding the Work Area	52
Recommended Materials and Equipment	52
Operating Guidelines	53
Routine Care	53
General Cleaning Safety Precautions	53
Cleaning the Computer Case	53
Cleaning the Keyboard	54
Cleaning the Monitor	54
Cleaning the Mouse	55
Service Considerations	55
Power Supply Fan	55
Tools and Software Requirements	55
Screws	55
Cables and Connectors	56
Hard Drives	56
Lithium Coin Cell Battery	56
SATA Hard Drives	57
SATA Hard Drive Cables	57
SATA Data Cable	57
SMART ATA Drives	57
Cable Management	57
Hard Drive Capacities	58
Removal and Replacement Procedures Microtower (MT) Chassis	59
Preparation for Disassembly	59
Computer Access Panel	60
Front Bezel	61
Front Bezel Security	62
Bezel Blanks	64
Memory	65
DIMMs	65
DDR3-SDRAM DIMMs	65
Populating DIMM Sockets	66
Installing DIMMs	66
Expansion Cards	68
System Board Connections	72
Drives	73
Drive Positions	75
Removing a 5.25-inch or 3.5-inch Drive from a Drive Bay	76
Installing a 5.25-inch or 3.5-inch Drive into a Drive Bay	77
Removing a Hard Drive from a Drive Bay	80
Installing a Hard Drive into an Internal Drive Bay	81
Removing and Replacing a Removable 3.5-inch SATA Hard Drive	83
Front Fan Assembly	88
Front I/O Assembly	90
Power Switch/LED Assembly	91
Heat sink	92
Processor	94
Speaker	95
Rear Chassis Fan	96
Power Supply	98
System Board	100
Removal and Replacement Procedures Small Form Factor (SFF) Chassis	102
Preparation for Disassembly	102
Access Panel	103
Front Bezel	104
Front Bezel Security	105
Bezel Blanks	107
Memory	108
DIMMs	108
DDR3-SDRAM DIMMs	108
Populating DIMM Sockets	108
Installing DIMMs	109
Expansion Card	111
System Board Connections	115
Drives	116
Drive Positions	117
Installing and Removing Drives	117
Removing a 5.25-inch Drive from a Drive Bay	118
Installing a 5.25-inch Drive into a Drive Bay	119
Removing a 3.5-inch Drive from a Drive Bay	121
Installing a 3.5-inch Drive into a Drive Bay	123
Removing and Replacing the Primary 3.5-inch Internal Hard Drive	125
Removing and Replacing a Removable 3.5-inch SATA Hard Drive	127
Fan duct	132
Front Fan Assembly	133
Hood Sensor	135
Front I/O, Power Switch Assembly	136
Speaker	138
Heat sink	139
Processor	141
Power Supply	142
System Board	144
Using the Small Form Factor Computer in a Tower Orientation	146
Troubleshooting Without Diagnostics	147
Safety and Comfort	147
Before You Call for Technical Support	147
Helpful Hints	148
Solving General Problems	150
Solving Power Problems	154
Solving Hard Drive Problems	155
Solving Media Card Reader Problems	158
Solving Display Problems	160
Solving Audio Problems	164
Solving Printer Problems	166
Solving Keyboard and Mouse Problems	167
Solving Hardware Installation Problems	169
Solving Network Problems	171
Solving Memory Problems	173
Solving Processor Problems	175
Solving CD-ROM and DVD Problems	175
Solving USB Flash Drive Problems	178
Solving Front Panel Component Problems	179
Solving Internet Access Problems	179
Solving Software Problems	181
Contacting Customer Support	182
POST Error Messages	183
POST Numeric Codes and Text Messages	184
Interpreting POST Diagnostic Front Panel LEDs and Audible Codes	192
Password Security and Resetting CMOS	196
Resetting the Password Jumper	197
Clearing and Resetting the CMOS	198
Restoring and recovering in Windows 7	200
System Restore	200
System Recovery	201
System Recovery when Windows is responding	201
System Recovery when Windows is not responding	202
System recovery using recovery media	202
Creating recovery media	203
Using recovery media	203
Battery Replacement	205
Power Cord Set Requirements	208
General Requirements	208
Japanese Power Cord Requirements	208
Country-Specific Requirements	209
Specifications	210
MT Specifications	210
SFF Specifications	212

Match case Limit results 1 per page

Table 9-2

Diagnostic Front Panel LEDs and Audible Codes (continued)

Activity

Beeps

Possible Cause

Recommended Action

Red Power LED flashes two

times, once every second,

followed by a two second

pause. Beeps stop after fifth

iteration but LEDs continue

until problem is solved.

Processor thermal

protection activated:

A fan may be blocked or

not turning.

The heat sink/fan

assembly is not properly

attached to the processor.

Ensure that the computer air vents are not

blocked and the processor cooling fan is

running.

Open hood, press power button, and see if

the processor fan spins. If the processor fan

is not spinning, make sure the fan's cable is

plugged onto the system board header.

If fan is plugged in, but is not spinning, then

replace heat sink/fan assembly.

Contact an authorized reseller or service

provider.

Red Power LED flashes three

times, once every second,

followed by a two second

pause. Beeps stop after fifth

iteration but LEDs continue

until problem is solved.

Processor not installed

(not an indicator of bad

processor).

Check to see that the processor is present.

Reseat the processor.

Red Power LED flashes four

times, once every second,

followed by a two second

pause. Beeps stop after fifth

iteration but LEDs continue

until problem is solved.

Power failure (power

supply is overloaded).

Open the hood and ensure the 4 or 6-wire

power supply cable is seated into the

connector on the system board.

Check if a device is causing the problem by

removing ALL attached devices (such as

hard or optical drives and expansion cards).

Power on the system. If the system enters

the POST, then power off and replace one

device at a time and repeat this procedure

until failure occurs. Replace the device that

is causing the failure. Continue adding

devices one at a time to ensure all devices

are functioning properly.

Replace the power supply.

Replace the system board.

Red Power LED flashes five

times, once every second,

followed by a two second

pause. Beeps stop after fifth

iteration but LEDs continue

until problem is solved.

Pre-video memory error.

CAUTION:

To avoid damage to the DIMMs or

the system board, you must unplug the computer

power cord before attempting to reseat, install, or

remove a DIMM module.

Reseat DIMMs.

Replace DIMMs one at a time to isolate the

faulty module.

Replace third-party memory with HP

memory.

Replace the system board.

Interpreting POST Diagnostic Front Panel LEDs and Audible Codes

183