dardruba

I've lost Eurosport International (in English language) FTA on Astra 1F, the only channel I need out of the remaining few thats left and the Tour de France starts today.

I Moved the channel to button one on the remote and now get No Signal
perhaps I should have done Swop. Usual good sound and picture on the
others.
I dont have a manual but I did 5.Setup programme, re inputted all the entries then Store and Store on button one. No Signal.
I changed a dead programme on button five to Eurosport inputted and Stored. No Signal.

Is there a way to do a Factory Restore and would that help?
Or can anyone remember another way to get the channel back working.