Default [Q] Root the Galaxy with a Mac & Power button

Hey y'all
So i know there is ways to root the 4.3 updated version of the galaxy s3 . is there a method to root it by a mac? i really don't have one and I'm hating knox and i want to try a different rom. So can anyone give me a help here?

Also my galaxy took a fall by the power button and what I'm wondering is there a way to fix it? It does work but sometimes if i touch it it starts to act weird and hard press the power button by itself and rebooting too. Can i fix it by myself or what?