Gift is only required for Non FTA channels.
If nothing works then there could be many reasons first check the obvious;
1. Your cable connections from you dish to the box.
2. Faulty LNB
3. Dish misalignment.
4. your signal level
If FTA channels works then check the followings;
1, Network connections i.e ethernet cable connections, router...etc
2. remove and re enter your gift line.
3. Ensure your gift is active with a little green tick
4. Update your channel list
5. Perform Blind scan on a single satellite.