Has anyone experienced this before

[Sam]

I loaded my product key for videobox pro on New Years eve. It was all working until today. I have turned it on and it is asking for a product key again. I cannot do this at the moment as I'm waiting for by to come and fix my broadband. Will it activate or do I have a problem. I have a 4 product keys for videobox 3 of which are working great. It's just this new one I have bought.
Thanks in advance for any help.
Sam

[Sam]

my broadband is now fixed and it says key invalid so how can I fix this. Would a duplicate key work.  I run a chain of pubs and this will be my 4 th box out there and they are mythering for it so want to get it sorted as all it needs is this activation, load with music and hang on wall. 
Thanks
Sam