This is primarily a customer self help forum and it may be about a week before someone from the VM forum team responds. For a quicker response it would be better to phone in.
I doubt anyone switching the box off would have caused a problem that would not have been fixed by turning off again for a few minutes. If it is the old Tivo, you may be able to get an upgrade to a new V6, If you are outside of the minimum contract period it may be worth calling in during the day and follow the menu to thinking of leaving rather than dealing with the normal fault reporting. They are UK based and deal with more than just leaving and may be able to offer a V6 and a better deal if you ask them nicely? No harm in asking.
Welcome to the Virgin Media Community, usually we ask users to create their own thread for a member of the team to take a look at this although as you're new here, I'll be happy to help.
I've located your account to run some tests and we're seeing the set top box as online and functional at the moment, I hope that means you're no longer experiencing the start up error you've mentioned?
If you are still experiencing the issue, get in touch and I'll do what I can to escalate this from our end for you.