Epix 2 totally blank

My Epix 2 was working totally fine until yesterday.  I got a message about some system update but since I was doing something ignored it. It started rebooting itself a few times and   10 minutes later it had gone black. Now it is totally dead.  I can’t get anything to come on the screen or any sign of life at all.  

I have tried: 

• charging it up for several hours (and used different leads in case that is a problem)

• doing a reset by holding the power button for a minute and 

• holding all buttons down

But Nothing has worked.  Has anyone else experienced this? 

Any ideas very welcome.