Since switching over to 8.1 when I go to switch my PC off after 5 seconds it will switch itself back on again, so I have to hard turn it off with the switch. Am I missing someone thing here?
Go into device manager and go to your keyboard and mouse, right click on them, select properties, I think they are under HID. There should be an option under one of the property tabs saying something like 'allow this device to turn on computer' and uncheck it Sent from my Nexus 7 using Tapatalk 4
Sleep your pc, then when it wakes itself go to cmd and type in powercfg -lastwake it may reveal the culprit and give you a starting point to resolve it.