Hi billywalsh57
The, "the DVR has detected a serious problem and is trying to fix it; do not switch off for 3 hours”. message is commonly known as the green screen of death. It means that your hard drive has failed. It's not very often that the box is able to recover from this, and if by some miracle it does, then it's only a matter of time before it fails completely.
You should try speaking to faults again, although best time to call is around 8am when lines first open and are least busy.
The IVR should recognise that you've already called and place you into a queue to speak to the agents.
If you hear the automated response asking you to press 1 for the link to online support etc then ignore all the options and don't press any buttons then you should be placed into a queue and an agent should pick up the phone and book the tech for you.
Or wait a day or two and a member of the Forum Team should pick this up for you and arrange a tech visit.