2001 Audi a4 B5 wont turn over. Need help
 

Hello, I have a 2001 Audi A4 B5.
I'll try and keep this short and straight to the point.
My Audi had a bad battery, I jumped it moved it and went to jump it again. But I like an idiot I put the cable back wards and fried the cables.
That's what I get for doing it in a hurry. Anyways there was nothing wrong with the B5 before but now that I tried 3 different battery's in it, it still won't turn over. It cranks but no start.
Please tell me what I F' up in the car because I'm getting a lot of different theories about what's wrong with it.
just hopping I blew a fuse some where.
Thanks for the help in advance.