Originally Posted by markocosic
Daft question - is there a way to exit the "USB Downloader" mode?
The previous owner was reading a book at the time, left the Kindle, and came back to it with a book apge stuck on and it unresponsive. Presumably all of the OS is still intact...
If the firmware is intact, do a hard reset by holding the power button for 30 seconds.
If it goes back to USB Downloader mode, that would indicate a problem with the firmware (or a bad mmc device). That is where it goes if it cannot find a bootloader on any of its potential boot devices (including the USB port).
You can also go there with the "magic" key, which is one of the Volume control buttons, as I recall (look in the thread hawhill mentioned).