I had a new TV6 box been delivered today, our other tv6 box in a different room is now coming up with the 7400 error. Any help on what to do or how to solve this issue? Thank you
Looks like you need to call it in (and speak to someone)...
I'd call as soon as they open in the morning (8am) as the queue shouldn't be as bad then.
You could also send a text with a description of the problem to 07533 051809. Your message will be queued but someone will get back to you (although it could take a couple of days)
You could try rebooting, if that fails you need to phone to get your box activated. 0800 953 9500.