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Andrew,
All of USB ports can recognise keypad and mouse (and floppy appears to be working but very often I have "not formatted disk" error, even after some of the files are listed), but nothing else, regardless of load (even externally powered devices are not recognised, for example USB HD)
That is why I am puzzled - because ports appear to be OK (when mouse or keyboard is connected), but anything else is just "unknown".
The stick I tried to use when this happened (it could be pure coincidence) was working previously, and it doesn't have any sort of encryption or protection.
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