!!
critical HP
Error Code Power LED blinks red, 7 blinks with a pause
System board failure detected from invalid ROM.
? What Causes This
Faulty motherboard or incorrect BIOS/ROM checksum.
✓ How to Fix It
Flash latest BIOS and reverify checksums. If persists, replace the system board and restart diagnostics.
Source: page 2 of the official manual
From the manual
This error code appears in:
HP Prodesk 600 G1 Small Form Factor PC