Sky hd won’t switch on no power

[Teresa+A123]

No power cut. 
Sky + hd box won't switch on 

[Mark39]

I assume no lights on the front panel. Check the fuse in the plug and try a different power socket. If it still won't switch on, the box has died and will need replacing. You can buy a cheap second hand Sky+HD box on eBay- look for DRX890 and DRX895 models. Or now might be the time to consider switching g to Sky Q, if that's an option.