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as per @farewell 's suggestion - shift into lowest gear at the rear and get the chain onto the lowest gear sprocket. then without pedalling shift into the highest gear to release the gear cable, this will hopefully give you enough slack in the cable to be able to push the cable through the shifter and you may be able to see if the cable is frayed inside the shifter
also sometimes when you fit a new mech hanger it may need a little tweak to get it to sit parallel to the plane of the wheel.
does the mech show any signs of crash damage - is it scuffed at all, it could be that the mech is bent (not just the hanger)
dancing james
Check the inner gear cable at the shifter end.
The inner cable on my 5800 shifters has split/frayed there a few times, causing dodgy shifting.