I have just a regular 2011 Kindle fire tablet. This happened a couple days ago, never had it happen before.. the Kindle fire logo will pop up like it's going to the (slide arrow) unlock screen but instantly goes to a plain red screen that I can't get past. I've held down the power button multiple times for 30-40 seconds, while plugged into charger and unplugged charger. I don't know why it's doing this and I don't know what other reliable ideas to try. Please help if you've had this happen before or have any ideas!!
It sounds like a software issue on the starting process. You've already done the usual troubleshooting for this inconvenience so I suggest you to contact us directly and check which other solution we may offer in this case!