If you can't get it to show up (even for a tiny amount of time) as some kind of USB device, that's not a great start, unfortunately. Short of opening it up to access the serial port, that severely limits your choices.
I'd still try to monitor the boot process w/ the device plugged to a Linux system, to see if/how it registers over USB during said process...
Just to give us a rough idea: what's the last part of the boot process you see (is the front light on? tree only? tree + spinner? tree + progress bar? if so, how complete is the progress bar?) before it loops back and finally ends up on the 'Your Kindle Needs Repair' screen?
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