My17" Macbook Pro is about 3 years old. The machine is exclusively used for sequencing in Logic where I also use the Kontakt instrument. About nine months ago the hard drive required replacement as it had become defective. Then about two weeks ago following return from a holiday where I had used the Mac Pro on a cruise ship, I suffered the black screen. The repairer confirmed the logic board to be defective and required replacement with either a new one or one that had been repaired. I have always treated the machine very carefully ensuring it to be turned off before moving it. I understand that there was a recall on the smaller screen varieties a year back by Mac following a loci board fault. I would appreciate any suggestions of how best to proceed.