Check the power cable and outlet
Remove all external devices
Restart the computer
Perform a hard reset
Check for error lights or beep codes
Run HP Hardware Diagnostics
Boot into Safe Mode
Update Windows
Update HP drivers and BIOS
Uninstall recent software or updates
Scan for malware
Check disk space
Run System File Checker
Run DISM repair
Restore the system to a previous point
Reset Windows
Reinstall Windows
Check RAM and storage connections
Replace faulty hardware
Contact HP Support