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Have you tried a full power off/on? That won't erase ANYTHING; but it will reload the operating system, close all running programs etc.
Hold the Power button down for a 4-5 seconds, until you see an option for "power off". Select that and let the NC power down. After it completely shuts off, you will need to hold the power button for approx 3 seconds to turn the NC on; it will then take about 30-60 seconds to boot all the way up.
FYI, you can also force a power off by holding the Power button down for about 10-15 seconds and it will power all the down w/o selecting anything else (but I don't think this is quite as graceful as the first option above).
My apologies if you have already tried this ... but many people forget that merely "tapping" the power button only puts the NC into suspend mode, rather than turning it all the way off.
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