So I fixed up my old lightning killed i7 960 so my friend can use it. Bought a new mb and a second hand gpu of carbonite. Was working 100% till he went for a smoke only to come back to a dead pc. I went over tested it whit a spare psu and all the fans case/cpu/gpu starts spining and all the mb lights are on but screen, keyboard and mouse are dead. Now is this cpu or mb ? (the psu that went got struck by lightning and had 1 dead rail so maybe was not the best option but the place fixing the pc did not tell me its a risk using said psu)