I had an issue with my old Nexus S where only a factory reset brought the satellites back so this is something you might want to try. I guess my issue was related to an update of Google Maps that somehow bricked the entire GPS and the factory reset rolled back both Google Maps and Google Play Services which both seem to play a role.
If this does not help, it is most probably a hardware issue.
Regards, Michael
mictale.com/ms
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