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These devices are small, and there isnt any repairs we can really do to them. No parts to replace other then the USB cord.
My advice, would be to grab an identical model at a low cost.. for instance, this one is brand new at 25$ and its t he same model you have.
That would work for you.. As far as why your device failed. Its possible that either heat, or condensation built up in the inside of the scanner depending on how it was stored. And that may have affected the small circuit board inside. However it happened, its clear the device isnt working and needs to be replaced.
If you have further questions, let me know.
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