How to Fix Dell Inspiron 15 3520 2 Amber 3 White LED Blink

Quick Diagnosis

This flashing pattern indicates that the system's power-on self-test (POST) has failed to detect system memory (RAM). The issue is commonly caused by a loose memory module in its slot, oxidation on the RAM pins, or a failed RAM stick.

Technical diagnostic blueprint diagram for the Dell Inspiron 15 3520 showing symptoms of 2 Amber 3 White LED Blink.

Step-by-Step Resolution

  1. 1

    Unplug the AC power adapter and shut down the laptop completely.

  2. 2

    Remove the bottom chassis cover by unscrewing the retaining screws to access the motherboard.

  3. 3

    Carefully locate the memory modules, release the metal securing clips on both sides, and remove the RAM sticks.

  4. 4

    Gently wipe the gold-plated contacts of the RAM sticks with a clean micro-fiber cloth to remove dust or oxidation.

  5. 5

    Firmly reinsert the RAM sticks back into the slots until they click securely into place, then reinstall the bottom cover.

  6. 6

    Plug in the power adapter and press the power button to verify if the laptop boots normally.

Alternative Causes & Edge Cases

  • Latitude 5420: A faulty primary memory slot requiring the RAM module to be relocated to the secondary slot.
  • Vostro 3510: Failed integrated motherboard RAM circuitry that requires a complete system board replacement.