got a install in my bmw and dont know what has happened but its stopped working so replaced the amp and still cant get it working so dont know what else to check as i am useless.

Fuse ?

good point. i was supposed to come up and have a look at this for you

im free over the weekend (sunday mostly).

if you want me to take a look, you have my number, give me a text or something when you are free

Its a break in the wire under the seat, you didnt say you put another amp in.
Who fitted it?

If Tony is unable to help, PM me and i'm sure we can sort something out.