my hp pavilion dv4 screen wont turn on but the cap, and num lock blink

[Gihan2]

my hp pavilion dv4 screen wont turn on but the cap, and num lock blink

[Raj_05]

Hi @Gihan2,

Welcome to HP Support Community.

Thank you for posting your query, I will be glad to help you.

When an HP Pavilion dv4 laptop screen won’t turn on and the Caps Lock and Num Lock keys blink, it usually indicates a hardware issue. Here are steps to diagnose and possibly fix the problem.

Count the Blink Codes

• The blinking lights are often an error code. Count the number of blinks between pauses to determine the specific error code. This can provide clues about the issue.

Power Reset

• Disconnect all external devices.
• Unplug the power adapter.
• Remove the battery (if possible).
• Hold the power button for 15-20 seconds.
• Reconnect the power adapter (leave the battery out) and try to turn on the laptop.

Check for Overheating

• Ensure the laptop is not overheating. Clean any dust from the vents and ensure proper ventilation.

Reseat the RAM

• Sometimes, reseating the RAM can fix the problem.
• Remove the RAM modules and reinsert them firmly. If you have two modules, try booting with one module at a time to see if one is faulty.

Hard Reset BIOS

• Turn off the laptop.
• Press and hold the Windows + B keys, then simultaneously press and hold the Power button for 2-3 seconds.
• Release the Power button but keep holding Windows + B.
• You might hear a series of beeps, and the BIOS recovery screen should appear.

External Monitor Test

• Connect the laptop to an external monitor using HDMI or VGA to check if the issue is with the display or internal components.

Check for Specific Error Codes

• Look up the blink code specific to your HP model. HP’s support website can help you decipher the code and determine the specific hardware issue.

Blink Code Interpretation

Each blink pattern corresponds to a different type of hardware error. Here are some common ones:

• 1 Blink: CPU error.
• 2 Blinks: BIOS corruption failure.
• 3 Blinks: Memory module error.
• 4 Blinks: Graphics controller not functional.
• 5 Blinks: General system board failure.
• 6 Blinks: BIOS authentication failure.

These steps should help in diagnosing the issue with your HP Pavilion dv4 laptop. If the problem persists, professional repair might be necessary.

I hope this helps.

Take care and have a good day.

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Alden4

HP Support