Door harness fixed now no sound?? Please help

[acerace]

Thanks for looking lads and lasses, got a problem with my radio

I had problem with windows and other things., was down to the wire harness being damaged what is a commen fault, had chance of new one or to get it fixed and chose the cheaper option, since then my system didn't work, it's a 10 speaker Bose system with sub woofer, ( what I love by the way) I was told of garage my radio head unit went, so I went out and paid nearly £200 for a new Sony double din, went to get it installed from a good well known place, he installed it as it should and no sound is coming out any where, a little noise soon after key ignition is turned, I think it's to do with the harness, should I have just bought a new one? Or has it been fixed wrong, I have the option from halfords who installed it to bypass the amp but Been told I will lose the subwoofer sound, is this a big difference? Any advice would be great,