So, I go to turn on my Aura HD this morning. I go to the main screen...but the right 1/3 is still taken up by a frozen image of the last book I was reading. Did every sort of reset, no luck. This is how it looks when it's powered off:
Call up Kobo Customer Care, tell them the situation, request warranty repair/replacement. They ask me to send pictures of front, back, and receipt. I do so, and get the reply (via phone call and email) that "the curved lines are a clear indicator of physical damage, which is not covered by our warranty". Escalate it, get the same reply.
This reader was never physically damaged in any way. BEWARE OF KOBO. They're using a fake claim of physical damage--and you can see from the picture the screen isn't damaged in any way--to avoid honoring their warranty.