I have no power in my attic and there are not any tripped breakers of GFCI in the house
Most circuits are wired as strings, from outlet to outlet to outlet in a line.  (An outlet is a receptacle or a hardwired load).  Sometimes they are wired in a tee or tree arrangement, but the same basic idea applies.  

Let's say the circuit is a string, PANEL - V - W - X -  Y - Z.  

Let's say X and everything past it (Y and Z) lose power, and W is the last outlet that is still good.  It is usually a faulty wire termination or damaged device at X or W.   

People often overlook the importance of the location before, W.