When you say it won't start up, are you getting anything on screen at all?
Are any lights on when you try to turn the box on (if not have you checked the fuse)?
If you are getting the box to actually begin to start then have you tried a YouView Maintenance Reset?
Try the Factory Reset keep recording option.
You will then need to reset your personal settings (such as parental controls / RF loop through / Surround Sound etc.) and also reset your scheduled recordings (might be worth taking a note of future recordings before doing this so you don’t miss any).
Hope it works but if not then please let us know and I’ll flag for further assistance.
A replacement Box is on the way,
Please log in to My Account if you need to view or pay your bill, manage boosts and track your usage. From My Account you can also check your connection and test your line for any issues in the Service Centre.
WEAR A MASK - WASH YOUR HANDS - SOCIAL DISTANCE