Identify the problem
Reproduce the issue
Check recent changes
Review error messages
Verify power and connections
Restart the device or service
Test with another cable, port, or device
Check settings and configurations
Update software, drivers, or firmware
Run built-in diagnostics
Isolate the failing component
Search logs for clues
Compare against known good behavior
Roll back recent changes
Test in a different environment
Consult documentation
Escalate if unresolved