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HP Pavilion dv6-6110sg Entertainment Notebook PC support

Computer Does Not Start and Emits an LED or Beep Code

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This document pertains to HP and Compaq Desktop computers.
If your computer makes one or two short beeps before starting, this is normal and your computer is telling you that BIOS startup was successful. If your computer beeps and does not start, a more serious hardware issue is likely occurring. This support document contains information that can help you learn more about the issue and how to resolve the problem.

What to do when beep codes occur

An LED or beep code usually means a basic function was unable to start. A basic function might be reading memory, displaying video, or being able to send information to a hard drive. The most common problems that cause LED and beep codes are memory and heat-related failures caused by a build-up of dust in critical cooling areas.
Use the following steps when your computer emits an LED code or beep code:

Step 1: Removing dust from cooling areas on your computer

If your computer is new and has never been used before, you may skip this step.
Over time, dust can collect in the cooling vents of your computer. Too much dust can block airflow, causing sensitive components to overheat and fail. Before troubleshooting for startup codes, it is important to remove any dust that might have accumulated.
While wearing eye protection, use canned air or the end of a vacuum cleaner to remove dust from vents, preferably outdoors.
Figure 1: Vacuuming dust from air vents
End of vacuum cleaner nozzle over side panel vent

Step 2: Performing a power reset if your computer does not start

If your computer does not start, first reset all power to device. Hopefully, the problem is temporary and can be fixed by performing the following steps:
  1. Disconnect all peripheral devices such as printers, USB storage devices and media cards.
  2. Disconnect the power cord from the computer.
  3. Press and hold the power button for at least 15 seconds until the power LED on the power supply is off.
  4. Reconnect the power cord, and press the Power button .
  5. Listen for sounds of drives and fans turning.
  6. If the computer still fails to start and emits beeping sounds, continue to the next section.

Step 3: Writing down the LED condition or beep code for troubleshooting

Use the following steps to write down the error conditions onto a piece of paper.
  1. Press the power button to turn on the computer.
  2. Look at the Power button on your computer's case and note its condition. If the light blinks, count the number of times it blinks between pauses.
  3. Listen to your computer for any loud beeping noises. If your computer makes a beeping noise, note the type and number of beeps between pauses. For example: two long beeps followed by one short beep.
  4. On a piece of paper, write down what you have noted to remember the error when doing the next steps.
NOTE:Boot or post codes have changed over time. Earlier computers use a series of beeps. The number and type of beeps depend on the age of the computer as well as the manufacturer of the motherboard and BIOS. With the development of the Extensible Firmware Interface (EFI) environment, many HP Pavilion and Compaq Presario computers built in 2011 or later can use blinking LEDS to identify hardware component reporting an error during startup. These codes are not valid for earlier models.

Step 4: Matching the beep code to a suspected hardware component for troubleshooting

Consult the Beep code descriptions section in this support document to try and find the component that is having a problem. You can use this information in the next step when performing the troubleshooting. Or, in the event your computer requires service, you can use this code and information when talking with the service personnel.

Step 5: Isolating and fixing a beep code problem

HP recommends that only someone with experience in working on computer hardware perform these steps. Incorrectly handling sensitive internal components can further damage the computer and can introduce the risk of personal injury.
WARNING:Using the correct environment for working on computers (ESD precautions and tools), use the following steps to isolate and fix the problem:
  1. Turn on the computer.
  2. Check the system fan and power cable:
    1. Hold the power button for five seconds to turn off the computer.
    2. Disconnect the power cord and then disconnect all external cords from the computer.
    3. Remove the side panel to open the computer.
    4. If the system fan was not spinning, make sure the system fan power cable is connected to the correct pins on the motherboard. Replace the fan if it was making excessive noise or was not spinning.
      If you had to plug in or replace the fan, replace the side panel, plug in the power cord and turn on the computer. If the beeps continue, continue to the next step.
  3. Perform each of the following tasks, in order, until the beeping stops:
    Before starting each task , unplug the power cord, and then remove the side panel.
    After completing a task , replace the side panel, connect the power cord, turn on the computer, and then listen for a beep code.
    NOTE:If removing or disconnecting a hardware component prevents the beep code, that component is probably causing the problem. However, a failed motherboard might produce beep codes associated with a component other than the motherboard. If specific beep codes continue after replacing the corresponding component with a known good part, the system board might be failing to detect hardware changes and might require a replacement CPU, system board, or both.
    Clean internal cooling components that have become clogged with dust.
    If the beeping continues, continue to the next step.
    Remove each memory module, replacing the one that was previously removed.
    NOTE:For videos with product specific steps on how to remove and replace this part, please see the HP Service Media Library . Search for your computer for the specific steps for that computer.
    • If the computer stops beeping, the memory module might be bad, is the wrong type of memory for the motherboard, or was not fully seated or connected. Reinsert the memory module into the socket to see if a connection was the problem. If problems continue, replace the module.
    • If beeping continues after checking all the memory modules, continue to the next step.
    Remove the graphics adapter, if there is one.
    NOTE:For videos with product specific steps on how to remove and replace this part, please see the HP Service Media Library . Search for your computer for the specific steps for that computer.
    • If the beep code changes or continues with the same beep pattern after you remove the graphics adapter, the adapter might still be good. Reseat the graphics adapter into its socket and continue to the next step.
    • If the beep code goes away, the graphics adapter might be bad. Reseat the graphics adapter, making sure it is fully locked into the connector on the motherboard. If problems continue, replace the adapter.
    Remove each PCI card, replacing the one that was previously removed.
    NOTE:For videos with product specific steps on how to remove and replace this part, please see the HP Service Media Library . Search for your computer for the specific steps for that computer.
    If the beep code goes away, the card might be bad. Reseat the card into its connector on the motherboard. If problems continue, replace the card.
    If beeping continues after checking all cards, continue to the next step.
    Disconnect each hard drive and CD or DVD drive cable (IDE and ATA) from the motherboard socket, and then replace the one that was previously disconnected, until all cables have been checked.
    NOTE:For videos with product specific steps on how to remove and replace this part, please see the HP Service Media Library . Search for your computer for the specific steps for that computer.
    • If the beep code goes away, the cable or socket is probably bad. Look for bent pins inside the IDE socket on the motherboard and straighten any bent pins. Reseat the cables into the connectors. If problems continue, the drive itself might be bad and might need replacing.
    • If beeping continues after checking all connections, continue to the next step.
    At this point, the problem is probably the motherboard or processor. Make sure any jumpers on the motherboard have not fallen off their pins and into the case. Make sure the jumpers are set correctly. Otherwise, have a qualified service center or HP service the computer.
    NOTE:For videos with product specific steps on how to remove and replace this part, please see the HP Service Media Library . Search for your computer for the specific steps for that computer.

Beep and LED code descriptions

Beep code tables are provided in the following sections of this document to help you isolate and understand the issue. This might reduce the time required to solve the problem. Read one of the following sections.
On some computers, the motherboard can flash or change the color of lights on the outside of the case, such as the power button LED and the hard drive activity LED. For computers that support this technology, lights blink and provide a beep to indicate a failure condition.
LED and beep conditionDescription
Power button LED blinks 4 times with 4 beepsPower Supply
Power button LED blinks 5 times with 5 beepsMemory
Power button LED blinks 6 times with 6 beepsVideo Card or Graphics
Power button LED blinks 7 times with 7 beepsMotherboard or System Board failure
Power button LED blinks 8 times with 8 beepsBIOS or CMOS problem (ROM)
Example of LED conditions: click a menu item to view the condition
The following beep codes are common to many HP and Compaq desktop computers. Use these codes before referring to the other codes when they occur.
BeepsDescription
1 short beep and 1 long beepMemory problem
2 short beeps and 1 long beep (repeats 5 times)Unable to initialize video or video card required but not installed
3 short beeps and 1 long beepCPU configuration error or CPU type is not compatible
The following beep codes are common to many HP and Compaq desktop computers that can occur while restoring, flashing or updating the BIOS :
BeepsDescription
1 short beepLegacy floppy drive or CD/DVD drive not detected
2 short beepsFloppy diskette or compact disc not detected
3 short beepsUnable to start flashing (such as when missing a utility or BIOS image)
4 short beepsFlashing failed (checksum error, corrupted image, etc.)
5 short beepsBIOS recovery successful
The following AMI beep codes can occur when there is a problem during the attempt of a normal system startup. You can use these codes to help troubleshoot issues related to system startup. When troubleshooting further, please refer to the section What to do when beep codes occur .
NOTE:The following codes can vary depending on BIOS version.
BeepsDescription
1Memory timing failure
2 Memory parity error
3Memory read or write failure
4, 5, 6, 7Fatal errors related to the operation of critical motherboard components - such as the CPU.
8 Video memory
The following table lists AMI beep codes that can occur when attempting to flash or recover the BIOS. You can use these codes to help troubleshoot problems related to system startup or flashing BIOS memory (such as in BIOS upgrades).
NOTE:The following codes can vary depending on BIOS version.
Number of beeps Post code
1 No media detected
2ROM file not found in root directory
3Insert next media volume
4 Flash Programming successful
5Failure while reading file
7Flash EPROM not detected
10 Failure while erasing flash memory
11 Flash program error
12 Problem with ROM file size
13ROM image does not match BIOS requirements
Most Award post codes are displayed to screen. If a beep code occurs the problem is likely occurring before the system can display video (check the video card or memory).
NOTE:The following codes can vary depending on BIOS version.
BeepsDescription
1 short beepPOST process completed successfully - normal startup
1 long beep followed by 2 or 3 short beepsUnable to initialize video (to display the post code)
Continuous beeping without pause Serious system related issue such as CPU overheating
Other beep conditionsMemory errors.
You can use these codes to help troubleshoot issues related to system startup or flashing BIOS memory (such as in BIOS upgrades). When troubleshooting further, please refer to the section What to do when beep codes occur .
Four series of beeps indicate a fatal error; that is, a problem exists which prevents the computer from starting. For example, there might be two beeps, a short pause, one beep, a short pause, one beep, a short pause, and then three beeps; this is represented as 2-1-1-3 in the chart below.
NOTE:The following codes can vary depending on BIOS version.
BeepsPost Code Description of failure
One short beep 0 POST process completed successfully - normal startup
1-1-1-302hVerify real mode
1-1-2-104hGet CPU type
1-1-2-306hInitialize system hardware
1-1-3-108hInitialize chipset registers with initial POST values
1-1-3-209hSet in POST flag
1-1-3-30AhInitialize CPU registers
1-1-4-10ChInitialize cache to initial POST values
1-1-4-30EhInitialize I/O
1-2-1-110hInitialize Power Management
1-2-1-211hLoad alternate registers with initial POST values
1-2-1-312hJump to UserPatch0
1-2-2-114hInitialize keyboard controller
1-2-2-316hBIOS ROM checksum
1-2-3-118h8254 timer initialization
1-2-3-31Ah8237 DMA controller initialization
1-2-4-11ChReset Programmable Interrupt Controller
1-3-1-120hTest DRAM refresh
1-3-1-322hTest 8742 Keyboard Controller
1-3-2-124hSet ES segment register to 4 GB
1-3-3-128hAutosize DRAM
1-3-3-32AhClear 512K base RAM
1-3-4-12ChTest 512 base address lines
1-3-4-32EhTest 512K base memory
1-4-1-332hTest CPU bus-clock frequency
1-4-2-134hCMOS RAM read/write failure
1-4-2-437hReinitialize the chipset
1-4-3-138hShadow system BIOS ROM
1-4-3-239hReinitialize the cache
1-4-3-33AhAutosize cache
1-4-4-13ChConfigure advanced chipset registers
1-4-4-23DhLoad alternate registers with CMOS values
2-1-1-140hSet Initial CPU speed
2-1-1-342hsInitialize interrupt vector
2-1-2-144hInitialize BIOS interrupts
2-1-2-346hCheck ROM copyright notice
2-1-2-447hInitialize manager for PCI Options ROMs
2-1-3-148hCheck video configuration against CMOS
2-1-3-249hInitialize PCI bus and devices
2-1-3-34AhInitialize all video adapters in system
2-1-4-14ChShadow video BIOS ROM
2-1-4-34EhDisplay copyright notice
2-2-1-150hDisplay CPU type and speed
2-2-1-352hTest keyboard
2-2-2-154hSet key click if enabled
2-2-2-356hEnable keyboard
2-2-3-158hTest for unexpected interrupts
2-2-3-35AhDisplay prompt "Press F2 to enter SETUP"
2-2-4-15ChTest RAM between 512 and 640k
2-3-1-160hTest expanded memory
2-3-1-362hTest extended memory address lines
2-3-2-164hJump to UserPatch1
2-3-2-366hConfigure advanced cache registers
2-3-3-168hEnable external and CPU caches
2-3-3-269hInitialize SMI handler
2-3-3-36AhDisplay external cache size
2-3-4-16ChDisplay shadow message
2-3-4-36EhDisplay non-disposable segments
2-4-1-170hDisplay error messages
2-4-1-372hCheck for configuration errors
2-4-2-174hTest real-time clock
2-4-2-376hCheck for keyboard errors
2-4-4-17ChSet up hardware interrupts vectors
2-4-4-37EhTest coprocessor if present
3-1-1-180hDisable onboard I/O ports
3-1-1-382hDetect and install external RS232 ports
3-1-2-184hDetect and install external parallel ports
3-1-2-386hRe-initialize onboard I/O ports
3-1-3-188hInitialize BIOS data area
3-1-3-38AhInitialize extended BIOS data area
3-1-4-18ChInitialize floppy controller
3-2-1-190hInitialize hard-disk controller
3-2-1-291hInitialize local-bus hard-disk controller
3-2-1-392hJump to UserPatch2
3-2-2-194hDisable A20 address line
3-2-2-396hClear huge ES segment register
3-2-3-198hSearch for option ROMs
3-2-3-39AhShadow option ROMs
3-2-4-19ChSet up Power Management
3-2-4-39EhEnable hardware interrupts
3-3-1-1A0hSet time of day
3-3-1-3A2hCheck key lock
3-3-3-1A8hErase F2 prompt
3-3-3-3AahScan for F2 key stroke
3-3-4-1AChPEnter SETUP
3-3-4-3AehClear in-POST flag
3-4-1-1B0hCheck for errors
3-4-1-3B2hPOST done--prepare to boot operating system
3-4-2-1B4hOne beep
3-4-2-3B6hCheck password (optional)
3-4-3-1B8hClear global descriptor table
3-4-4-1BChClear parity checkers
3-4-4-3BehClear screen (optional)
3-4-4-4BFhCheck virus and backup reminders
4-1-1-1C0hTry to boot with INT 19
4-2-1-1D0hInterrupt handler error
4-2-1-3D2hUnknown interrupt error
4-2-2-1D4hPending interrupt error
4-2-2-3D6hInitialize option ROM error
4-2-3-1D8hShutdown error
4-2-3-3DahExtended Block Move
4-2-4-1DChShutdown error
4-2-4-3DehKeyboard Controller Failure
4-3-1-3E2hInitialize the chipset
4-3-1-4E3hInitialize refresh counter
4-3-2-1E4hCheck for Forced Flash
4-3-2-2E5hCheck HW status of ROM
4-3-2-3E6hBIOS ROM is OK
4-3-2-4E7hDo a complete RAM test
4-3-3-1E8hDo OEM initialization
4-3-3-2E9hInitialize interrupt controller
4-3-3-3EahRead in bootstrap code
4-3-3-4EbhInitialize all vectors
4-3-4-1EchBoot the Flash program
4-3-4-2EdhInitialize the boot device
4-3-4-3EehBoot code was read OK

Testing computer memory for troubleshooting

If the computer can access part of the memory, it might be possible to access the BIOS Setup Utility display and perform a memory self-test to identify other memory issues. If the computer cannot boot to the BIOS Utility, try removing and reseating the memory and the hard drive, and then repeat the following steps to perform the memory self-test.
  1. Plug the AC adapter into the computer.
  2. Turn off the computer.
  3. Press the Power button to start the computer and repeatedly press the f10 key to enter the BIOS Setup menu.
  4. In the BIOS Setup Utility, use the Right Arrow or Left Arrow keys to navigate through the menu selection to locate the Diagnostics .
  5. Use the Down Arrow or Up Arrow keys to select Memory Test .
  6. Press Enter , and then Yes to perform memory test.
  7. After test completes, press f10 key to Save and Exit , and then press Enter key to Exit Saving Changes .
If the test fails, one or more of the memory modules might not be seated properly. Check for and reseat loose memory modules.

Finding repair service

Many of the problems associated with LED or beep codes require service or parts replacement. To find an HP authorized service provide, go to www.hp.com/go/support .
HP Pavilion dv6-6110sg Entertainment Notebook PC

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