It's unlikely it's out of warranty. Let Asus fix it.
I have an Asus T101MT netbook/tablet, and it won't turn off. It says that it's logging off and closing down, and then nothing more happens. I've even left it overnight, and even after 17hrs it hadn't turned off. I have to kill it with the on/off button.
It's been this way since I unpacked it. I bought it from a fly-by-night online firm which is now out of business, so no help there.
I guess this behavior can also interfere with its ability to install updates correctly. Am I right?

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