Sorry, can't help with the firmware for a re-flash -- I'm lucky and not had to do this so far (on the cybook....).
Just to confirm, if you plug your Cybook into your computer, the red light does (sometimes) come on okay to indicate that it is charging. A little later (to make sure that the battery has power) you turn the Cybook on (whilst it is still plugged into the computer) the LED changes colour, but nothing happens to the display, and the computer doesn't show *any* messages from dmesg. The same happens if you use a different USB port. (And you do get the usual sequence of USB mesages as Linux scans and automounts other USB drives?)
To me, that sounds like something is hanging very early on in the boot process on the Cybook, since neither screen nor USB are responding. This could mean something has corrupted part of the system disk, or it could be more serious (i.e. component failure -- but at least you should be under warranty). I'd guess that a reflash is the easiest way to suggest which it is, but I have no idea what the status about warranty is with that.
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