AC Running but Not Cooling? Diagnose Where the Cooling Stops
AC running but not cooling? Start at the vents to separate airflow, cooling-stage, outdoor-unit, frozen-system, and whole-house performance problems.
Dryer Running but Not Heating? Diagnose What Still Works First
Dryer running but not heating? First check whether it makes any heat, then narrow the problem to settings, airflow, power, gas, or service.
Refrigerator Not Cooling? Diagnose What’s Still Cold First
Dryer running but not heating? First check whether it makes any heat, then narrow the problem to settings, airflow, power, gas, or service.
WiFi Connected but No Internet? Diagnose Your Device, Router, or ISP
WiFi says connected but nothing loads? Use one other device to quickly separate device, router, DNS, public WiFi, and ISP problems.
Laptop Only Works When Plugged In? Diagnose the Battery Before Replacing It
Laptop only works when plugged in? Use the shutdown pattern, battery detection, health test, and power connection to find what actually failed.
Laptop Plugged In but Not Charging? What to Check First
Laptop plugged in but not charging? Check the charge limit, charger, wattage, battery, port, and adapter recognition before replacing parts.
Laptop Turns On Then Immediately Shuts Off? What to Check First
Laptop powers on and immediately shuts off? Follow this diagnostic order to check power, battery, overheating, startup hardware, and Windows.
Laptop Turns On but Screen Is Black? What to Check First
Laptop powers on but the screen stays black? Use this diagnostic order to separate display, Windows, and startup hardware problems.
Laptop Won’t Turn On but Charging Light Is On? What to Check First
Laptop won’t turn on even though the charging light works? Follow this diagnostic order to check the charger, battery, display, and startup hardware.