Your troubleshooting approach is solid and systematic! Starting by confirming the type of connection—wired or wireless—is essential, as it allows you to narrow down the possibilities quickly. Double-checking the SSID and password is a smart move for Wi-Fi connections, as it can often resolve connectivity issues. Using tools like the command prompt to check IP connectivity is also a good step, as it helps identify any deeper network problems.
Additionally, I would suggest inquiring about any recent changes or outages reported by the ISP, as this information can provide valuable context. If the problem persists across multiple devices, guiding the customer to reach out to their ISP is definitely the right call. Overall, your methodical approach ensures that you cover all bases while providing effective support. Great job!