I downloaded the OS X on my air and I can't use my keyboard and it won't let me restart my computer because it says that the application assistant canceled the shut down, I don't know what to do

I downloaded the OS X on my air and I can't use my keyboard and it won't let me restart my computer because it says that the application assistant canceled the shut down, I don't know what to do

When all else fails (it sounds like it has) hold the power button for about 10 seconds. This shuts down the computer. Then tap it to restart. Since it sounds like the OS upgrade began but then failed to perform a restart you may find that the Install Mavericks file is still in the Applications folder and you can try again. Or you might find that you have to redownload. I don't think the installation is going to proceed as if the computer had successfully restarted but I could be wrong (and in this case gladly so for your sake.)

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