turbo not working

[benjii]

 well i got a 2007 golf gti mk5 i just had the cambelt and water pump done today all ok till i was driving home gave it a boot and just heard the turbo whine really loud and it didnt kick in. Will be taking it back tomorrow to tell them but just wondering if they have broke somthing or a pipe come off. If it is a pipe which one hopefully i can get to it and sort it to nite