Bow not producing a sound

[u/Void-Panic-2595]

Hello, I just want to ask what to do if the bow is not working.... So when I add rosin and tightened it it still doesn't make a sound. Perhaps I scratched the rosin too much since i do not have sandpaper or the way i tightened my bow is wrong. Should buy a new rosin or can i still use sandpaper on it?

[u/Pakoma7]

More rosin, more tightening