Hello, I'm TV Tech1 and I'll be working with you to identify and help you resolve your problem.
A lot of these units are energy saver units, so you do need to remove power from them for 20 minutes for them to reset. Did you do that?
Yes, I left it for an hour
Ok, if you did do that, you really will have to get it exchanged. Sky HD rents their boxes, you don't have to buy them do you? I see both options, but I believe rental is better due to upgrades