nothinguntil

I resurched starting problems and didn't find my problem at all. I was driving my car just fine about 2 weeks ago and about a year ago I replaced my starter with a brand new one and I also got a new battery before I had to travel to PA for work. Well my brother has been driving my car since I've been gone and he has had no problems untell yesterday. He tried to start it and it wouldn't do anything at all. The engine dosn't even turn over because the started isn't doing anything at all when my brother turns the key in the ignition. What in the world could cause this??? Brand new started and battery and starter will not turn over at all which in turn means the engine as well will not turn over as well. Hope someone out there has had this same problem so my brother can fix it and I can come home to a working car.