I have had this happen a few times but was always able to get it flowing again. What happens, after shutting off the main water supply to the house 1 bathroom faucet fails to "prime" for lack of a better term. The hot water side flows fine but the cold water side, nothing. After a day or so the cold water side will flow a bit with the valve slightly open but if you open it all the way the flow stops. Only happens to this one outlet.
I have had it happen in the past and have tried opening all the valves in the house, trying to completely evacuate the system and have got it to work, but I think it was luck....not sure how to do it again.
We are on a slab with overhead galvanized pipe (I know, horrible) if that makes a difference. Seems that this particular line doesn’t prime or something....very puzzling....any thoughts?