@RexGalore is right. My K3 locked up and would not respond in any way to the power switch, even to turn it off. I plugged it into an electrical outlet (not USB) and after a short while, the screen control returned and I was able to resume using it. As I mentioned in other posts on MR, turn the K3 off with the power switch (about 5 seconds) to a blank white screen BEFORE putting it into the Kindle cover if you are using one. You can then insert the cover hooks without problems, and the K3 will resume in a second or two from that off mode after you remove it from the cover. Do not insert the hooks in the automatic 'sleep' mode -- turn it off. Do not use the cover when using the K3 and you'll have no problems. A minor nuisance to turn it off, but it's only 5 seconds off and 1 second back on.
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