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My Nexus 7 had been performing without any issues, however, I locked the screen by pressing the power button as usual and then tried to turn it on several hours later but it was unresponsive.

How can I fix this?

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For me this seems to occur more frequency after a full charge. –  gary Dec 6 '12 at 2:57
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2 Answers 2

up vote 5 down vote accepted

I've managed to deal with this problem by performing a "soft reset".

Hold down the power button for around 30 seconds, the device should start a soft reset (i.e. you don't lose any data/settings etc.) and reboot.

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Why it blocked and prevented me from performing a screen unlock remains to be explained.

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I hope "reset" here means a soft-reset and not a factory reset. Am I right? –  Suraj Bajaj Dec 7 '12 at 7:07
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Yep that's right, I'll clarify in the answer. –  Peanut Dec 7 '12 at 11:16
    
I remember that behaviour too, but not in the last 2 months, iirc. Have you updated to the last version (4.2.1)? Could you still get a response by adb shell or adb logcat? –  ott-- Dec 26 '12 at 0:29
    
@ott I updated as soon as I could get it OTA, I didn't try anything but the soft reset, if iit happens again I'll give them a go. –  Peanut Dec 26 '12 at 15:56
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For those that tried the soft reset to no avail: some tablet covers have magnets in them used to toggle the screen on and off. If your cover is poorly made, it may trigger the screen to turn off at inopportune times, e.g. when you have it folded back like a book cover and it's turning your screen off as soon as you get past the lockscreen.

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