I changed power settings from "do nothing" to "sleep after 30 minutes" and turn monitor off after 30 minutes. Went to use it an hour later and it was in deep sleep. Couldn't get it to start with mouse or keyboard and when I pressed the power button it just switched off. Started it up and changed the setting to "never" on both and now when I tell it to shutdown it switches monitor off, shuts down the hardrives but keeps the processor fan and cooling fans spinning. To get it to start up again I have to press the start button. Also had a look in UEFI (ASROCK H77M) to see if there was a way of switching the settings off that power usb devices when in sleep mode in case it had hiccupped on that score, and couldn't find a setting to change. To turn the pc off I now have to tell it to shutdown and then wait umtil just the fans (and what else) are still running and turn it off at the wall. Any one any ideas?? I@ve spent a couple of hours on internet and no luck.