!!
critical HP
Error Code 8 blinks, 1 blink every second followed by a 2 second pause
System powers on but is unable to boot.
? What Causes This
Boot issues - likely hardware or BIOS errors.
✓ How to Fix It
Reset CMOS, run diagnostics and system checks. If necessary, replace faulty components.
Source: page 2 of the official manual
From the manual
This error code appears in:
HP Elitedesk 800 G1 Small Form Factor PC