Okay, I'm not having the same issue, but I'm pretty sure I've completely, irevicalbly, bricked my kindle.
I know that I'm not in Fastboot mode, I've experienced that issue and solved it with the KFU.
Here's what I did:
I used the KFU to root my kindle. That worked fine. I was able to load all the Google apps (which was my initial goal). Then, I got greedy and decided that ICS was my next step - oops.
I followed the instructions on the following site:
Note: I know, I'm an idiot - I should have paid attention to comments! UGH!
After I did this, I now only get the firefirefire logo and that is it. I can't load/reload TWRP and I can't change my bootmode to normal or recovery. The thing is, no matter which computer I plug the device into, the computer won't recognize the device. I get a message saying something "malfunctioned" when I plug it in. I've tried 3 different Windows machines (I've installed/reinstalled drivers I don't know how many times!) and I even tried loading Linux on a spare laptop and that didn't work either.
So, I tried the next thing I could think of. I followed the instructions on the following site:
ramble.karrth.com - Section "Troubleshooting TWRP
which involved removing the back cover, shorting a circuit (to force usbboot) and plugging my Kindle in. This didn't work for me either.
At this point, I'm willing to try anything. I'm not quite sure how to fix this issue. I think my next step is to either order a factory cable or make my own and try that, but if my bootloader is broke (truely broke) will that even work?
Please, if I should post this in another forum/place, just let me know. Any help appreciated!