Blank black screen after upgrade

Ready for chucking BT Vision box through the window. Ever since BT Vision upgraded earlier in the year it keeps shutting down and restarting for no apparent reason, sometimes up to six times a day. Sometimes it goes for days with no problem. The current problem is that yesterday it shut down and restarted with a message that it was going to install a new upgrade. It then went through the process of downloading an upgrade tool. At the end it displayed a message that the download was successful and it would now begin installing the new upgrades. The screen then went black with no error message. It would not respond to any commands and wouldn't switch off. I tried forcing a restart and switching off and unplugging everything and restarting the hub to no avail. All it does is go through the whole routine again with the same end result. I tried leaving it in that state overnight, thinking that it might update or correct itself through time but still the same. It just sits in the corner of the living room staring at me malevolently.

In the end we gave up and did a factory re-set (left and bottom button) so lost all our recordings - what a stupid system!
We had tried every method of resetting and rebooting before then and nothing worked. Plugs in and out, hub rebooted, black adapters reset, power cables in and out, OK and bottom buttons etc and every time when it restarted it downloaded new software (or so it said) and then kept rebooting until every time it just stuck on a black screen which we seem to have spent hours looking at since Wednesday!!!
Anyway all is working OK now - fingers crossed - just no recordings to watch. I'm trying not to think of all the lovely interesting programs I had saved for a 'rainy day'.

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