I assume that there was already a dish at the house? (you don't say.) and you plugged you sky box in to the signal cable from it.
As you sky box worked before and doesn't now it means that there is a problem with the Dish/LNB/signal cable. You need to check that you have the correct dish/LNB for Sky digital. That is is pointed at the correct satellite group (Astra 28.2) and correctly aligned. That the cable between the LNB and the Sky box is OK.
t
September 2007