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1. When the keyboard indicator light Num Lock and Caps Lock indicator lights flash after the machine is turned on, it is generally a hardware fault alarm of the machine. The faults of different machines are different according to a series of flashes of the corresponding indicator lights. , the following are the faults represented by flashing:

Battery power LED indicator flashes: Battery is low

Flashes 1 time - Caps Lock/Num Lock CPU CPU cannot operate normally

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Flashing 2 times in a row - Caps Lock/Num Lock BIOS BIOS corruption failure

Flashing 3 times in a row - Caps Lock/Num Lock memory module error cannot operate normally

Continuous Blinks 4 times - Caps Lock/Num Lock The graphics card controller is not functioning properly

Blinks 5 times in a row - Caps Lock/Num Lock System motherboard General system motherboard failure

Blinks 6 times in a row Times - Caps Lock/Num Lock BIOS BIOS authentication failure

2. The solutions to the problem vary depending on the flashing machine. If your machine encounters related problems, it is recommended that you follow the instructions. What does the flashing light mean? Follow the following methods to solve the problem:

1. Low battery power

If the battery indicator light (looks like a lightning bolt) flashes, it indicates the remaining power of the battery. Not enough to start the computer. To resolve this issue, try the following workarounds.

a. Connect the laptop to AC power and start the computer again.

b. Check the AC adapter to make sure all plugs are plugged in.

c. Determine whether the power LED on the AC adapter is on (if available) and whether the computer is receiving AC power from the wall outlet.

d. If the computer can run normally using AC power, please charge the battery for thirty minutes to an hour, and then restart the computer.

NOTE: Charging the battery for thirty minutes to an hour is called "trickle charging." "Drip charging" uses low-current continuous constant-current charging that will slowly charge the battery when it is in a deep discharge state. Deep discharge occurs when a battery has not been used for a long time.

2. The CPU cannot operate normally

The computer processor (flash code 1) cannot operate normally. Contact HP Care Pack for assistance. Regarding the contact information of the Gold Service Center, you can select your province, city and product type through the following URL:

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3. BIOS corruption error

If a BIOS corruption error occurs (flash code 2), you may not notice the flash code because the computer will restart immediately when it realizes the error. Try restoring BIOS and reboot again. As a result, you may notice a very long boot process and a message may appear on boot stating that the BIOS has recovered. If this happens, update the BIOS on your computer.

4. Module error does not allow normal operation

If you encounter a memory failure (flash code 3), please follow the guidelines in the table below.

If you are using:

a. Original memory New memory

Reinsert the memory. If reinserting the memory does not resolve the problem, replace the memory with new memory. Reinsert the memory. If the error code still appears after reinstalling the memory, there may be a problem with the memory itself. Remove the new memory from the computer, put the original memory back into the computer, and retest.

b. If you are unwilling to reinstall the memory yourself, please send your computer to a computer retailer and ask them to help you reinstall the memory.

NOTE: Some memory module errors allow your computer and operating system to start before restarting and displaying a flash code.

5. The graphics controller does not operate normally

If you encounter a graphics controller failure (flash code 4), please contact the HP Gold Service Center for help.

6. Conventional system motherboard failure

Conventional system motherboard failure (flash code 5) refers to the failure of components not included in other LED error codes. Contact HP Care Pack for assistance.

7. BIOS authentication failure

BIOS authentication error (flash code 6) rarely occurs. The problem occurs when there is an inconsistency between the BIOS and hardware installed on the computer. This problem occurs when the BIOS cannot verify the signature of the system hardware. The goal of BIOS authentication is to ensure that nothing has affected the BIOS on the computer. If BIOS authentication fails, the computer automatically performs BIOS recovery. If the computer cannot automatically restore the BIOS, perform a manual BIOS restore. To perform a manual BIOS recovery, press the four arrow keys simultaneously to cause the BIOS to go to the EFI partition to find and restore the current BIOS.

Note: You can also refer to the following official document for this issue:

/portal/site/hpsc/public/kb/docDisplay/?docId=emr_na-c02006301

I hope the above reply will be helpful to you.