A warm welcome to the forums
I'm sorry to hear that you're having trouble viewing the BBC HD channel. I'll be happy to help check this out for you.
If nothing is listed on our Service Status Page for your area then give the box a reboot (If you haven't already) and this will hopefully restore the channel.
If not, if you can let me know if other channels are affected, what happens when you try and view the BBC channel. I'm here to help, keep me posted
Tech fan? Have you read our Digital life blog yet? Check it out