HP Laptop Caps Lock Blink Codes — POST Error Guide

What Does This Error Mean?

HP laptops use caps lock or num lock blink codes to indicate POST errors when there is no display. Count the blinks — each pattern points to a specific hardware fault (1 = CPU, 2 = BIOS, 3 = memory, 5 = video, 6 = embedded controller).

Affected Models

HP Pavilion
HP EliteBook
HP ProBook
HP Envy
HP ZBook
HP Spectre

Common Causes

1 blink: CPU not functioning or seated correctly
2 blinks: BIOS corruption or BIOS update failure
3 blinks: memory module not detected or failing
4 blinks: graphics chip failure
5 blinks: video subsystem failure
6 blinks: embedded controller fault
7 blinks: motherboard failure

How to Fix It

Count the blinks carefully.

Watch the caps lock LED. There is a long pause between repeats. Count the blinks in one cycle — that is the error code (1, 2, 3, 4, 5, 6, or 7).
Try memory reseating for 3 blinks.

If you see 3 blinks (memory error), unplug the laptop, remove the bottom panel, and reseat the RAM module(s). Clean the contacts gently with a dry cloth. Try one stick at a time if you have multiple.
Try BIOS recovery for 2 blinks.

Hold Windows + B while pressing the power button. This triggers HP's BIOS recovery from a USB flash drive (download HP's BIOS recovery file for your model first).
Contact HP service for other blink counts.

1, 4, 5, 6, or 7 blinks indicate failures of the CPU, graphics, video, EC, or motherboard. These are not user-repairable. Contact HP support — if your laptop is in warranty, repair or replacement is covered.

When to Call a Professional

Most HP blink codes indicate hardware failures that require board-level repair. The exception is memory (3 blinks), which is often user-fixable by reseating the RAM module.