!!
critical HP
Error Code Power LED blinks red, 5 blinks with a pause
Pre-video memory error detected during boot.
? What Causes This
Video memory failure or incompatible RAM module.
✓ How to Fix It
Check and reseat RAM modules; if issue persists, replace system board.
Source: page 2 of the official manual
From the manual
This error code appears in:
HP Prodesk 600 G1 Small Form Factor PC