!!
critical HP
Error Code Screen Message: Option ROM Error (101)
ROM or expansion card option failure.
? What Causes This
Faulty firmware on system board or additional hardware module.
✓ How to Fix It
Reflash ROM/firmware images or eliminate problematic cards. Restart diagnostics process, consider replacing system board if continued.
Source: page 3 of the official manual
From the manual
This error code appears in:
HP Prodesk 600 G1 Small Form Factor PC