Yamaha AX 900 u trouble

[RIPPER03]

Hi,first post here,hope i get this right..lol
I have a yamaha ax900u which i love and pounds..well,it did.....
somethin went wrong.....i can plug the rca jacks into any input and get only a very faint sound......the only thing that works is pluggin it in the "main" input,in which it has no volume control....can anyone help?
thx