I've got a 2012 edition of the Amazon Kindle Fire HD (tate) which I love . Unfortunetly, while doing a bit of DIY modding, I was forced to resort to using my handy fastboot cable. I can boot the tablet into fastboot, but upon plugging in my normal USB cable, my laptop tells me that "the connected USB device has malfunctioned, and Windows doesn't recognize it." I posted a thread in my device forum (http://forum.xda-developers.com/show....php?t=2750416), and this was the reply:
Ouch, I think I have seen this before, not positive but I,m guessing your fastboot cable shorted the chip in charge of USB related stuff.