1. Press Windows + R key together to open Run window.
2. Type msconfig in the Run window and press Enter key to open System Configuration Utility window.
3. Go to Boot tab in System Configuration Utility window and check Safe Boot option after selecting it from drop-down list under Boot Options section.
4. Click OK button to save changes and restart your Windows PC in safe mode with networking option selected by default on next screen of System Configuration Utility window.
HP laptop Boot Device Not Found Error (3FO) is a common issue. It can occur due to any of the following reasons:
Corrupted or missing system files
Corrupted system registry
Virus or malware infection
Hardware failure
Hard disk failure