ive had a simular thing with mine. Switched it off then later on switched back on and it displays waiting for time/channel not avaliable.
Tried reflashing the service files no joy, even tried letting the box scan, but it found a few transponders but no channels.
Try using a different service and bouqet file. I had the same problem. changed the services and voila... don`t ask me why or how... but it worked. try and get a hold of someones in your area that has been self scanned.