Most time you can soft reset the device by holding the power switch for 20 secs or a little longer in the off position (this will power the device off), and then press again the power switch to power the device on. Be aware that the screen does not change when you power off in this way (so you do not know exactly at which point the device is powered off, or whether you still have to continue keeping the button in the off position). You can only see that it worked if you are able to power on afterwards.
There could however be situations in which this does not work. This happened to me only once or twice.
Last edited by tshering; 07-25-2016 at 07:18 AM.
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