Win8.1 System Start screen power button missing fault analysis and solution
Reason one: Updata version not installed
Since the Win8.1 also has many versions, the early win8.1 system Start screen is not the power button, after the release of the first Updata update to add the Start Screen power button function, so you are very likely to download the earlier Win8.1 installation disk.
Workaround:
1, use Automatic Update to try to update to the latest version;
2, or download win8.1 updata version reinstall.
Cause two: Installed system components are compromised
The win8.1 system you are installing may have component damage.
Workaround:
The following command can be executed under the CMD interface, and the desktop will automatically generate a TXT document, which will have previously failed to repair the file information. You can then confirm the location of the file by searching the file names directly under C disk, and copy the files with the same name on the normal running Windows 8.1 and replace the problem on the computer.
FINDSTR/C: [SR] Cannot repair member file "%windir%logscbscbs.log"%userprofile%desktopsfcdetails.txt
Windows 8.1 System, you can also use the DISM command in CMD to try to fix the problem.
Dism/online/cleanup-image/restorehealth
The above is the Win8.1 System Start screen power button is missing two reasons and the solution of all the contents of the introduction, set up, power options appear again.