I experienced similar symptoms with an Aura. I had done no modification (FW 3.15) on a pretty new Aura. One day is froze, I did the reset routine and it would start, but then freeze part of the way through the process. It eventually froze and would not react. I charged and tried again - nothing.
I contacted Kobo (I bought the unit from their website since you cannot buy these in a US store) and they took me though the reset / charge routines again, and then had me send a photo (to show the screen was not broken), then gave me a return authorization.
About 1 day later, without the unit on charge I decided to push the buttons again - voila! It came to life. While I waited for the replacement it kept freezing, and I would have a similar experience - after leaving it sit it would start. Of course, I accepted the replacement and returned the Aura. I suggest letting it charge for a few hours and then letting it sit for a day.
You should get in touch with Kobo and start the process of getting a replacement before you run out of warranty coverage. I found them to be careful to make sure you really had a problem, but not hard to deal with and the return process was easy.
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