!!
critical HP
Error Code Red LED flashes 10 times
Bad option card - incompatible or faulty expansion cards present issues with booting.
? What Causes This
Problematic peripherals like graphics cards, network controllers.
✓ How to Fix It
- Remove the suspected bad option cards and try rebooting to see if they caused an issue.
- Once identified, replace them.
Source: page 3 of the official manual
From the manual
This error code appears in:
HP Compaq Pro 6300 SF Desktop