Thank you very much for the reply Mark, it's always a pleasure to have someone to talk to in this hard cases.
I've just asked Schofiel for (the third) repair but still no answer, if he doesn't have time, would you please consider to give it a look? I'm quite good with solderings of normal components and chips but i can't do SMD, do you think I can give it a try?
In the end, do you have an idea of the cause of this failure? Does the HD upgrade could be the problem? Thanks.