Windows diagnostics missed lightning damage that had destroyed a dial-up modem
A tech support worker called Lachlan traced a senior executive’s sudden email failure to a dial-up modem damaged by lightning. The case shows that software checks can report a device as healthy even when physical damage has made it unusable.
Lachlan checked the network settings, cables, phone line and modem responses in Windows Device Manager, all of which appeared normal. When he opened the computer, he found a soot mark where the modem’s voltage regulator had been destroyed; the executive said email stopped during a lightning storm, and the component had been designed to protect the modem from the phone line’s voltage.
In short
- Windows reported the modem was working.
- Lightning had destroyed its voltage regulator.
- A physical inspection revealed what software checks missed.
Explained simply
Dial-up modems connect computers to the internet through a telephone line. Lightning can send a sudden surge of electricity along that line, damaging equipment inside a computer.
Windows Device Manager checks whether a device is recognised and can respond to software, but it cannot confirm that every component is physically intact. A modem may therefore appear normal in software while damage prevents it from working.
This case involves Lachlan, a tech support worker, and a senior executive whose email stopped working during a storm. It illustrates why diagnosing computer faults can require both software checks and inspection of the hardware.
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Originally published by The Register as “Windows said modem worked fine. That unmistakable scorched electronics smell suggested otherwise”.