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HP Notebook PCs - Troubleshooting LED Blink Codes or Beep Codes During Startup or Boot
There are many reasons that a computer does not startup or boot into the Windows operating system. If your computer will not start or boot, you will see or hear symptom to indicate the general area of the problem. If you are not sure what the problem is, see Overview of How to Troubleshoot Problems When a Computer Does Not Start Up or Boot Properly .
Startup Symptom: LEDs blink or computer beeps but does not start
Use this document if the notebook does not start, but the LEDs near the keyboard blink several times, or there are a series of beeping sounds, just after the power button is pressed.
The blinking LED lights on newer computers, or the beep tones on older computers, will help support agent determine what hardware component is not responding properly. The exact meaning of each code varies with the model, and the user cannot change any of the blink or beep codes.
DO THIS FIRST - Perform a hard reset
If a PC suddenly fails to boot properly, you should perform a hard reset as the first procedure.
Get technical assistance
When you see blinking LEDs or hear beep tones, you should contact HP for technical assistance. Report the number of LED blinks, or the number and duration of the beep tones, and the model or product name of your computer. The Support Agent can help you troubleshoot the startup problem.
Table of Sample Blink Codes
The following table illustrates the meaning of blink codes used on some notebooks with EFI environment. The blink or beep codes on your computer may have different meanings. When you contact HP for support, the agent needs to know the model of your computer and may ask you about blinking LEDs or beeping tones to help troubleshoot a startup problem.
Common solutions for issues that cause blinking LEDs or beep tones
There are some common actions that an HP support agent may ask you to perform to resolve issues identified by blink codes or beep codes. By performing these actions before you contact the support agent, you may be able to resolve the issue yourself. When the computer can boot into the BIOS, run the memory test to identify other issues.
Check for loose connections and test the memory
Blink codes are often displayed after a user adds memory to the computer but does not seat the module properly. The LEDs may also blink error codes if a hardware component is loose because the computer was dropped or jarred. Some HP Notebook PCs come with one stick of memory but have two memory slots. The problem could be that the stick of memory or one of the memory slots has a bad connection.
The memory module compartment on most notebooks is located on the bottom of the case. The exact position varies by model. However, on some models, the memory compartment is under the keyboard. See your User Guide for the exact location of memory modules on your notebook.
NOTE: Removing and reseating memory modules requires the use of tools and the partial disassembly of the computer. If you do not feel comfortable doing this work yourself, take the computer to an authorized retailer for technical service.
Check for loose memory modules
If a memory module is loose or is not making good contact with the memory slots, the computer does not recognize all of the memory. Reseating the memory module may resolve memory failure errors. To reseat the memory module, take the memory module out of the memory slot and then put it back into the slot to get a better connection so that the computer can recognize the memory.
The memory module compartment on most notebooks is located on the bottom of the case, however, on some models, the memory compartment is under the keyboard. See your User Guide for the exact location of memory modules on your notebook.
Use the following steps to remove and reseat the memory modules:
if the computer fails to boot to the Windows desktop after the memory is reseated and the battery is installed, contact HP for support.
Perform memory self test
If the computer can access part of the memory, it may 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.
If the test fails, one or more of the memory modules may not be seated properly. Check for and reseat loose memory modules.
What to do when the computer starts into Windows normally
After you have completed the troubleshooting process and your computer has booted normally into the Windows operating system, you should:
For detailed information on this topic, see HP Notebook PCs - Update Your Computer After Troubleshooting a Problem .