Hardware⏱️ 1 min read📅 2026-05-26

How to Fix Code 3 Error – HP ProDesk 405 G6 SFF (Ryzen 5 3400G) - POST Code 3 Lon

HP ProDesk 405 G6 SFF issues after SATA short-circuit

The POST code 3 long 4 short blinks after a SATA short-circuit on the HP ProDesk 405 G6 SFF with Ryzen 5 3400G can be fixed by replacing the motherboard.

🛠️ Step-by-Step Verified Fix:

  1. Disconnect all peripherals and cables from the affected system.
  2. Unplug the power cord and any other external power sources.
  3. Remove the side panel to access the motherboard.
  4. Locate the short-circuited SATA port and carefully remove it from the motherboard.
  5. Install a new motherboard that is compatible with the system's specifications.
  6. Reconnect all peripherals and cables, and plug in the power cord.
  7. Boot up the system and enter the BIOS settings to verify the POST code has changed.

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