HP laptops are programmed with LED error codes to help you identify the problem when something goes wrong. The problem may be as simple as a dead battery or as serious as a vital system malfunction. Knowing what to look for can help you narrow the cause of the problem and quickly find a solution. Though these steps will be able to offer some repair strategies, certain problems can be remedied only by contacting HP customer service.
Plug in your laptop's power adapter. Make sure that both ends of the adapter are securely connected to both the laptop and to the power source (such as the wall socket or power strip). If the screen turns on, you may use your computer. If not, it is possible that the battery is completely depleted.
Wait 30 minutes to allow the battery to sufficiently charge. Press the power button to reboot the computer. If the blinking has stopped, then a low battery was to blame for the problem. If the blinking continues, proceed to Step 3.
Download the "softpaq" file for your laptop from the HP support website. This file includes BIOS and driver updates. You will need to enter your geographical location and the model number of your laptop (see the first Resource link). Once the softpaq file has downloaded, double-click the file to launch the installation wizard. Follow all on-screen prompts. You may need to restart your computer. Once installation is complete, your BIOS should be fully updated. If you still see blinking lights, continue to the next step.
Count the number of blinks. All HP computers are programmed with error light codes. Figuring out the code will help you find the root of the problem. The codes and their corresponding causes are as follows:
One blink: Unresponsive CPU (computer processing unit)
Two blinks: Corrupted BIOS (Basic Input/Output System)
Three blinks: Nonfunctional module error
Four blinks: Nonfunctional graphics card
Five blinks: General system board failure
Six blinks: BIOS authentication error
Contact HP customer service and tell a representative your error code (see the second Resource link).