How to Fix HP Pavilion 15 Caps Lock Blink 3 Long 2 Short

Quick Diagnosis

This LED blinking code indicates that the embedded controller timed out during memory initialization. The physical hardware cause is typically an unseated RAM module, a bad electrical contact, or a defective RAM stick.

Technical diagnostic blueprint diagram for the HP Pavilion 15 showing symptoms of Caps Lock Blink 3 Long 2 Short.

Step-by-Step Resolution

  1. 1

    Power down the laptop, disconnect the AC charger, and remove the external battery if applicable.

  2. 2

    Press and hold the power button for 15 seconds to drain all residual electrical charge from the system board.

  3. 3

    Remove the bottom cover of the laptop to access the memory modules.

  4. 4

    Locate the RAM sticks, release their retention clips, pull them out, and clean the slots with compressed air.

  5. 5

    Reinsert the RAM modules firmly at a 30-degree angle and press down until the metal clips snap into place.

  6. 6

    Reassemble the chassis, connect only the AC power adapter, and boot the computer to test.

Alternative Causes & Edge Cases

  • EliteBook 840 G5: A faulty memory channel slot on the motherboard that requires using a single RAM stick in the alternative slot.
  • HP Chromebook 14: Failed soldered memory chips on the mainboard that require a complete motherboard replacement.