Reading earlier posts from when mine was semi-bricked, the error a newer preloader produces is that it wont write to NAND.
IIRC, if you successfully enter preloader mode you shouldn't see the Amazon logo.
Do you hear the 'connect' sound on your computer when you plug device into your computer and turn it on? Has the A-A cable worked with other devices?
AFAIK, the only other method is a hardmod which I think someone else posted on this site.
Ah got you (sorry was being thick) - yes have tried that too, still sticks at 0%.
Could it be anything to do with the sdcard? (tbh, i've tried 2 different cards, both fat32 and the required files are in the root of each).
From the sound of things, I now have a square black drinks coaster don't I?!