!
error HP
Error Code Power LED flashes Red three times and then white two times
Memory is installed incorrectly or is bad.
? What Causes This
Incorrect DIMM installation, faulty memory modules,
✓ How to Fix It
- Reseat DIMMs; Power on the system.
- Replace DIMMs one at a time to isolate the faulty module.
- If necessary, replace third-party memory with HP memory.
- As a last resort, replace the system board.
Source: page 98 of the official manual
From the manual
This error code appears in:
HP Elitedesk 800 G3 Small Form Factor PC