If you dont' know how to use the nodes I find it easier to find a file you are looking for by searching and when it finishes search search for more until it can't search then it will disconnect and reconnect (which means a new node) then you can continue search'n eventually the file you are looking will come up. So when u clik hashes and you get no sources just type the file name in the search bar, and follow the steps above. Holla at ya boy!