How to mend Wire Door Switches

I purchased mikomo KM80546 but is not working?

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Green light on my Belkin router is on all the time?

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help -t gateway modem-tg797nv3 --?

on developing an expert system that fix car?

Packard bell laptop?

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USB SSD drive disconnects mid-copy?

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external hard drive switch?

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Recovery?

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