!!
critical HP
Error Code Red LED 3 blinks every second followed by a 2 second pause
The processor is not installed or detected.
? What Causes This
Processor failed to initialize, possibly due to incompatible hardware or loose connection.
✓ How to Fix It
- Verify and replace the processor if necessary.
- Ensure proper seating of CPU socket components.
- Contact service to confirm compatibility issues.
Source: page 4 of the official manual
From the manual
This error code appears in:
HP Elitedesk 800 G1 Small Form Factor PC