You are an IT support technician in a large office building. A user reports that their laptop intermittently stops charging whenever the computer is jostled or the power plug is moved. Which component is most likely defective?
Wall outlet at the user's desk
Laptop AC jack
CMOS battery
Laptop DC-in (power) jack
Laptops run on low-voltage direct current (DC). The external AC adapter converts the building's AC mains into the DC voltage the laptop needs and plugs into the laptop's DC-in (power) jack. If that jack becomes loose or its solder joints crack, moving the plug breaks the electrical connection and the battery stops charging. Replacing or re-soldering the DC-in jack resolves the issue. The CMOS battery only maintains firmware settings, the wall outlet would affect any device plugged into it, and laptops have no separate "AC jack."
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