switched from N1 to N2 i messed up my n1 so bought a used N2 everything works on it but no sound not even menu sounds i used the n1 cables too hook it up they looked the exact same same colour wires at the back... any suggestions?

Try switching the power antenna output to remote out. It sounds like your amplifier(s) are not turning on...

also try switching unit connect bus wires ith newer ones they cause that issue also.