As users continue to update their Surface, Surface 2, ARM and x86-based tablets to the Windows 8.1 update, many are finding that the power button – which lets you put the device to sleep, shut down and restart it – is simply missing from the top-right corner of the tablets' home screen.
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How to create a USB Surface RT recovery image to fix Windows RT 8.1 update issue
According to Microsoft, not every device has a power button because this feature is tied to a setting called "Power Platform Role" that is set by PC manufacturers.
If the PC is set as a slate, the power button will not appear after installing the Windows 8.1 update because tablets are not designed to be turned off and users could easily accidentally tap the button.
If the device is set as a "mobile device", such as a laptop or ultrabook, the power button will appear on the home screen.
