That seems to be a strange problem, although it is possible for Windows to turn a PC on after it's completely powered off. There are other things you could try (I may be repeating some previous suggestions):
1. Troubleshooter: Open 'troubleshooting' by searching for it after pressing 'win key'...
If you want to shut it down and startisback++ doesn't work, you can use the Windows 8.1 default:
1. Windows key + I then click on Power, and you should be able to shut down.
If you want to add the hibernate button (this will work for startisback++)
1. search for 'Power Options' using the search...
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