AskManual.ai
!!
critical HP

Error Code Red flashing LED four times, once every second separated by two-second pause followed by a continuous beep sequence ending with silence but LEDs continue flashing

Critical malfunction usually due to internal critical system faults possibly related to processor thermal management.

? What Causes This

Processor cooling fan failure or heat sink mis-attachment.

✓ How to Fix It

1. Ensure correct ventilation and check that fans run properly during the start-up process for any issues.

Source: page 79 of the official manual

From the manual

Manual page 79 — HP error Red flashing LED four times, once every second separated by two-second pause followed by a continuous beep sequence ending with silence but LEDs continue flashing

This error code appears in:

HP Prodesk 400 G3 Desktop Mini PC