It might be searching for free to Air Digital channels im not sure there are any here allthough i was told BBC 3 and 4 can be picked up on the digital ready tv's .
If its piped into the apartment its prob piped on the old system that your tv and video use . try checking the options on the digi box . But i feel it might be the wrong piece of equipment your using .( basically no digital signal going into the digi box so it cant pick up anything ) .
My new tv has a build in digital recever but i get the same message after searching to check the aerial . I can tune in RTE etc using rabit ears . I dont have the digital linked up to my playroom as its just for the PS3 and Xbox in there . If im watching TV im in the sitting room anyway .
I think your best bet is to get a new tv or go into like dixons or something and pick up a 25-30 euro DVD player that you can hook up like your video set up .
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