The correct approach to troubleshooting your system
When attempting to troubleshoot any issue, we need to isolate where the root cause of the fault could lie by a logical process of elimination.
The art of effective troubleshooting is the application of logic and deductive reasoning.
At the start of a troubleshooting process, never rule out anything as not a potential cause of the problem. Every aspect of the installation should be considered as a potential suspect. Each component of the installation should be ruled out one-by-one and only then eliminated from the troubleshooting process as the potential problem.