⚠
warning HP
Error Code Continuous beeps or single beep
Computer not responding after power button press, could indicate software control failure.
? What Causes This
Software malfunction, causing improper handling of shutdown signals from hardware switch input.
✓ How to Fix It
1. Hold the power button for 4 seconds to force system shutdown before unplugging cord.
Source: page 73 of the official manual
From the manual
This error code appears in:
HP Prodesk 400 G3 Desktop Mini PC