So I installed Greenify last night, I have no idea if it has caused this but it was the last thing I did before my phone went kaput so I am working on that theory now. Last thing my phone did was have the bar "Greenify has been granted SuperUser" or words to that effect and then hung. I tried a reboot at this point by holding down the power button for 10 seconds, screen turned off but phone did not reboot. From that point my phone has been completely unresponsive.
The phone registers as there when plugged into my PC, but doesn't show up to move files to/from. Also when plugging in a UTG cable the phone powers external devices. I am thinking at this point of running the battery down till the phone HAS to switch off and then plugging it in and seeing if anything different happens. Any other advice would be appreciated.