If you do not want to get a new box and if it is the hard drive that has failed you can buy a suitable hard drive for not a lot of money and it is a simple 15 minute job to replace the failed one.
The operating software is not stored on the hard drive so there is nothing to install. Just follow the format instructions when you first start it up.
@Kimberlin i am not advocating using the box as non recording box rather a way to reset the the box without losing the historic recordings. The fact that the box still currently allows access to those historic recordings and presumably updates o the the box TV guide does indicate that the hard drive is still usable , So a reset of the box keeping recordings is the logical approach.
@zulu17
Thanks, not sure I'm sufficiently confident or skilled to even know what hard drive to look for, compatibility issues, and what-have-you. But I take your point, if one is confident and has the knowledge then the drive could be replaceable.
Also, I can't see how to keep my recordings, it looks to me that a factory reset is the only option 😕
My 16 year old TV does not have an HD tuner (ie no DVB-T2 support) so that using a separate Freeview box to watch the HD channels makes perfect sense. I actually use a different PVR to do this which has an option to keep the hard disk spun down when not needed for recording or time-shifting so minimal extra energy usage.
@Jakedrum
To reset, and keep recordings, you would need to reset via the maintenance mode menu.
For the DTR-T4000 (and the DTR-T2100 variants) according to the BT website:
https://www.bt.com/help/tv/fix-a-problem/tv-boxes/how-do-i-reset-my-bt-tv-box-
@Lսkе
Thank you, I looked online but couldn't find the process of the DRT T4000.
Done that now, thanks again for your clear guidance.
It has kept all of my old recordings, but sadly it still won't let me record anything any more.
It is not entirely useless as it will allow me to rewind live TV, but I can no longer schedule any recordings 😕